Inspection And Repair Of The M9 Pistol

MARINE CORPS INSTITUTE

INSPECTION AND REPAIR OF THE M9 PISTOL

MARINE BARRACKS WASHINGTON, DC

Table of Contents Page Contents........................................................................................................................ Navigation Instructions .................................................................................................

i iii

Chapter 1

1-1

Disassembly and Assembly of the M9 Pistol ............................. Operator Controls and Weapon Safety Operator Controls....................................................................... Clearing Procedures ................................................................... Additional Safety Features ......................................................... Operator Disassembly and Assembly Operator Disassembly ............................................................... Operator Assembly..................................................................... Disassembling and Assembling the Magazine ............................ Disassembling the Barrel and Slide Assembly ............................ Removing the Locking Block, Plunger, and Pin.......................... Removing the Extractor from the Slide....................................... Removing the Firing Pin Block from the Slide .......................... Removing the Thumb Safety from the Slide ............................... Removing the Firing Pin from the Slide...................................... Removing the Rear Sight from the Slide..................................... Assembling the Barrel and Slide Installing the Locking Block, Plunger, and Pin ........................... Installing the Rear Sight onto the Slide....................................... Installing the Firing Pin and Extractor in the Slide...................... Installing the Thumb Safety into the Slide .................................. Installing the Firing Pin Block in the Slide ................................. Disassembling the Receiver Removing the Grips ................................................................... Removing and Disassembling the Magazine Catch Assembly..... Removing the Disassembly Latch Lever..................................... Removing the Trigger Bar.......................................................... Removing the Slide Stop ............................................................ Removing the Trigger ................................................................ Removing the Lanyard Loop and Mainspring............................. Removing the Hammer............................................................... Removing the Sear ..................................................................... Removing the Hammer Release Lever, Firing Pin

1-1 1-4 1-5 1-6 1-9 1-11 1-13 1-14 1-15 1-16 1-18 1-20 1-21 1-22 1-23 1-24 1-26 1-28 1-29 1-31 1-32 1-33 1-34 1-35 1-36 1-37 1-38

Continued on next page

i

Table of Contents, Continued Block Lever, and Ejector............................................................ Removing the Grip Screw Bushings ........................................... Assembling the Receiver Installing the Grip Screw Bushings............................................. Installing the Ejector, Hammer Release Lever, and Firing Pin Block Lever ......................................................................... Installing the Sear and Spring ..................................................... Installing the Hammer ................................................................ Installing the Mainspring and Lanyard Loop .............................. Installing the Trigger and Trigger Bar ........................................ Installing the Slide Stop ............................................................. Assembling and Installing the Magazine Catch........................... Installing the Disassembly Latch Lever and Grips ...................... Chapter 2

1-39 1-40 1-41 1-43 1-45 1-46 1-48 1-50 1-52 1-53 1-54

Troubleshooting, Inspecting, and Repairing the M9 Pistol Functioning Cycle ..................................................................... Feeding ...................................................................................... Chambering................................................................................ Locking...................................................................................... Firing ......................................................................................... Unlocking .................................................................................. Extraction and Ejection .............................................................. Cocking...................................................................................... Diagnosing the Causes of Malfunctions Failure to Feed ........................................................................... Failure to Chamber or Lock........................................................ Failure to Fire............................................................................. Failure to Unlock, Extract, and Eject .......................................... Failure to Cock........................................................................... Inspecting the M9 Pistol Types of Inspections................................................................... Steps for Conducting an Inspection ............................................ Conducting an M9 Pistol Inspection ........................................... Repairing the M9 Pistol Operator Responsibilities ........................................................... Unit Responsibilities .................................................................. Intermediate Maintenance Activity (IMA) Responsibilities ........ Graphics.....................................................................................

ii

2-1 2-2 2-4 2-5 2-6 2-9 2-10 2-11 2-13 2-15 2-16 2-18 2-19 2-20 2-23 2-25 2-29 2-31 2-32 2-33

NAVIGATION INSTRUCTIONS FOR THE M9 PISTOL PDF

Text Link

Blue highlighted text indicates link to graphics. Simply click on area of highlighted text to go to a graphic corresponding to the text displayed.

Graphic Link

Clicking a graphic will return you to the area of text corresponding to the graphic displayed. In some cases, a graphic may be linked by two areas of text. If so, the graphic will be linked twice (double linked). The left side will be linked to the first area of text and the right side will be linked to a later or secondary area of text. For example, the graphic labeled 1-4 is linked to text on pages 1-2 and 1-4. It pertains to the thumb safety text located on both pages. The left side of graphic 1-4 will be linked to text on page 1-2; the right side of the graphic will be linked to text on page 1-4.

Double Links

This file contains the following double links. Graphic 1-4 1-8 1-18 1-25 1-26 1-30b 2-9 2-10

Primary Page 1-2 1-3 1-8 1-11 1-11 1-14 2-6 2-6

Secondary Page 1-4 1-4 1-9 1-12 1-12 1-22 2-7 2-7

iii

CHAPTER 1 DISASSEMBLY AND ASSEMBLY OF THE M9 PISTOL SECTION 1. OPERATOR CONTROLS AND WEAPON SAFETY Operator Controls

Key Features Click here for figure 1-1.

Before you handle any piece of equipment, you should know what you are doing. This holds especially true of a firearm! The key features of the M9 pistol are the • Magazine catch • Thumb safety • Slide stop

Magazine Catch Click here for figure 1-2.

The following table describes the location, function, and operation of the magazine catch.

Location On either side of the pistol, in the pistol grip at the juncture of the grip and the trigger guard.

Function Operation Allows the magazine to Can be pressed with fall or be withdrawn either the thumb or from the weapon. middle finger; either way, the magazine should drop from the grip. If friction binds it, you may have to grasp the bottom of the magazine well. Whenever possible, catch the magazine before it hits the ground. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-1

Chapter 1

Operator Controls, Continued

Thumb Safety Click here for Figure 1-3.

The following table describes the location, function, and operation of the thumb safety. Location At the rear of the slide just forward of the hammer, protruding from both sides of the slide so it can be engaged with either thumb. When the wings • Slant downward and cover the warning (red) dot on the slide, the safety is ON (engaged). Click here for figure 1-4. • Are horizontal exposing the red dot, the safety is OFF (disengaged). Click here for figure 1-5.

Function When the safety is ON, it • Rotates the striker out of firing pin contact and into the slide so a falling hammer cannot strike the firing pin. • Uncocks the hammer when the hammer has been cocked to the rear and prevents the hammer from being recocked. • Disconnects the hammer from the trigger.

Operation Push upward with the thumb of your shooting hand on either of the wings to turn the safety OFF and expose the red dot.

Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-2

Chapter 1

Operator Controls, Continued

Slide Stop Click here for Figure 1-6.

The following table describes the location, function, and operation of the slide stop. Location The most rearward lever • on the left side of the pistol underneath the slide.

Function Automatically holds the slide to the rear after the last round has been fired.

•

Locks the slide to the rear so you can check the chamber during clearing procedures.

Operation To manually engage the slide stop when no magazine is in the pistol, hold the pistol in your shooting hand. Grasp the slide with your non-shooting hand and pull it fully to the rear. Click here for figure 1-7. To disengage the slide stop, push down with your shooting thumb so the slide returns to battery (forward position). Click here for figure 1-8.

CAUTION: Remember if one or more rounds are still in the magazine, one will be chambered when the slide returns.

MCI Job Aid Inspection and Repair of the M9 Pistol

1-3

Chapter 1

Clearing Procedures

Clearing the M9 Pistol

The following table describes the steps to clear the M9 service pistol. Step 1 2

Action Place the weapon on safe by rotating the ambidextrous thumb safety to the downward position. Click here for figure 1-4. Remove the magazine by • •

3

Pressing the magazine release button in. Catching the magazine as it falls from the pistol. Click here for figure 1-9. Lock the slide to the rear by • •

4

MCI Job Aid Inspection and Repair of the M9 Pistol

Pulling the slide to the rear with your left hand. Locking the slide in place by pushing up on the slide stop with your right thumb. Click here for figure 1-8. Inspect the chamber by tilting the weapon up so you can see into the chamber. Make sure no rounds are present.

1-4

Chapter 1

Additional Safety Features

Chamber Loading Indicator Click here for figure 1-10.

The extractor (also known as the chamber-loading indicator) shows whether the chamber is loaded or unloaded. Located next to the ejection port, the extractor blends into the contour of the slide when no round is in the chamber.

Firing Pin Block Click here for figure 1-11.

The firing pin block prevents the firing pin from moving forward if the pistol is dropped. The block catches the firing pin and moves out of the way only when the trigger is pulled.

Double Action

When the hammer is forward, the pistol can be fired by pulling the trigger to the rear. The force required for double action virtually precludes this from happening by accident. Once the first round has been fired, subsequent rounds will be fired by single action unless you engage the thumb safety and let the hammer fall.

Half Cock Notch

The pistol has a half cock notch just like the M1911A1 .45 caliber pistol. If you ever cock the pistol by hand and your thumb slips off the hammer before the weapon is completely cocked, the half cock notch prevents the hammer from falling on the firing pin If the pistol is at half cock, however, simply pull the trigger to fire double action. CAUTION: Since the notch is designed only as a back-up safety, you should not carry the weapon on half cock. If the pistol were to fall, the impact could damage the sear and sear pin.

MCI Job Aid Inspection and Repair of the M9 Pistol

1-5

Chapter 1

SECTION 2. OPERATOR DISASSEMBLY AND ASSEMBLY Operator Disassembly

Key Features Click here for Figure 1-12.

The following table lists the parts of the weapon and their locations. You should know them before executing any disassembly or assembly actions. Part Slide Group Barrel Group Recoil Spring and Guide Group Receiver Group Magazine Group Disassembly Lever

Location On the upper section of the pistol. Inside the slide group. Inside the slide group.

On the lower section of the pistol. Inside the magazine well of the receiver group. Below the slide. It is the most forward lever on the left of the weapon. Disassembly Button Below the slide, on the right of the weapon. Recoil Spring Guide In the slide group. Recoil Spring On the recoil spring guide in the slide group. Locking Block On the barrel. Locking Lugs On the locking block on the barrel.

Main Groups

The M9 pistol can be disassembled into five main groups: • • • • •

Slide Barrel Recoil spring and guide Receiver Magazine Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-6

Chapter 1

Operator Disassembly, Continued

Removing the Slide, Barrel, and Recoil Spring and Guide Groups

The following table describes the steps to remove the main groups from the receiver. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. WARNING: Clear the weapon before disassembly! NOTE: Although you can disassemble and assemble the pistol with the thumb safety either ON or OFF, keep the safety ON for safety reasons. Step 1

2

3 4

5

Action Extend your right forefinger along the receiver until you can depress the button. Depress the disassembly button and hold it in that position. Click here for figure 1-13. With the thumb of your left hand, rotate the disassembly lever in a downward clockwise motion until it stops at a 90-degree angle. Click here for figure 1-14. Release pressure on the disassembly button. Grasp the slide and pull it (along with the recoil spring and guide) forward off the receiver. Click here for figure 1-15. WARNING: Grasp the underside of the slide to keep the recoil spring, which is under tension, from shooting out from its recess. Set the receiver aside since nothing more will be removed from it.

CAUTION: Never dry fire the pistol with the slide removed. Doing so could damage the hammer and frame. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-7

Chapter 1

Operator Disassembly, Continued

Removing the Recoil Spring and Guide

The following table describes the steps to remove the recoil spring and guide from the slide. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1 2

3

Removing the Barrel from the Slide

Action Cradle the slide upside down in your left hand and compress the spring slightly with your right thumb. Click here for figure 1-16a. Once the spring is compressed, lift up on the rear of the guide and pull the spring and guide from the slide. Click here for figure 1-16b. Separate the spring from the guide.

The following table describes the steps to remove the barrel from the slide. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1 2

3

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Lay the slide upside down on a flat surface. Look down into the slide to see the locking lugs (Click here for figure 1-17a) engaging the shoulder cutouts (Click here for figure 1-17b) in the slide. With the thumb and forefinger of your right hand, grasp both sides of the locking block and lift it until it clears the shoulders of the slide. Click here for figure 1-18.

1-8

Chapter 1

Operator Assembly

Installing the Barrel into the Slide

The following table describes the steps to install the barrel into the slide. The steps are the reverse of disassembly. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1

2 3 4

Installing the Recoil Spring and Guide into the Slide

Action Cradle the barrel upside down in your left hand. Push it forward until the muzzle barely protrudes from the slide. Click here for figure 1-18. Grasp the locking block lightly between the thumb and forefinger of your right hand. Insert the barrel, muzzle first, into the slide. Make sure the locking lugs engage the locking lug shoulders of the bolt. Push the barrel slightly rearward to lock it into position.

The following table describes the steps to install the recoil spring and guide into the slide. The steps are the reverse of disassembly. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2 3

Action Fully insert the recoil spring guide in the spring. Insert the free end of the spring into the spring recess in the front of the slide. Click here for figure 1-19a. Compress the spring slightly; rotate the guide, head down, until it rests in the guide groove. Make sure the guide fits snugly in the groove. Click here for figure 1-19b. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-9

Chapter 1

Operator Assembly, Continued

Installing the Slide, Barrel, and Recoil Spring and Guide Groups

The following table describes the steps to install the slide, barrel, and recoil spring and guide onto the receiver. The steps are the reverse of disassembly. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2

3 4 5

6

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Pick up the receiver. If the hammer is cocked, gently lower it until it meets the receiver frame. Click here for figure 1-20. Grasp the front section of the slide with your left hand, placing your thumb on the recoil spring and guide so the spring and guide do not become misaligned with the locking block. Carefully guide the rear portion of the slide rails onto the front portion of the receiver rails. Click here for figure 1-21. When the rails are well engaged, push the slide all the way against the hammer, pushing the hammer slightly rearward. Rotate the wing of the disassembly lever counterclockwise to its closed position. Click here for figure 1-22. As soon as you rotate the lever, the recoil spring guide (under pressure from the spring) should force the disassembly lever up with a loud click. To verify correct assembly, pull the slide back and release it. It should close energetically.

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Chapter 1

Disassembling and Assembling the Magazine

Key Features Click here for Figure 1-23.

The following table lists the parts of the magazine and their locations. You should know them before executing any disassembly or assembly actions. Part Magazine Tube Follower Magazine Spring Floorplate Retainer Floorplate Retainer Stud

Disassembling the Magazine

Location The body of the magazine. Inside the body of the magazine. Inside the body of the magazine. Attached to the bottom of the magazine spring. Attached to the bottom of the magazine. Inside the floorplate.

The following table describes the steps to disassemble the magazine. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1

6

Action Hold the magazine upside down with its back pressed against the palm of your hand. Click here for figure 1-24. Locate the retainer stud hole in the center of the floorplate. Press in on the stud with a cleaning rod section or the locking block plunger on the barrel. While pressing on the stud, push the floorplate forward with your thumb just far enough for the stud to clear the stud hole. Slide the floorplate fully forward and off the magazine tube, then ease up on the spring pressure. Click here for figure 1-25. Pull the floorplate retainer, spring, and follower from the tube.

7

WARNING: Do not try to remove the floorplate retainer from the spring; the manufacturer assembled the floorplate and spring as a complete unit. Remove the follower from the spring. Click here for figure 1-26.

2 3 4 5

Continued on next page

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Chapter 1

Disassembling and Assembling the Magazine, Continued

Assembling the Magazine

The following table describes the steps to assemble the magazine. The steps are the reverse of disassembly. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1

2

3 4

5

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Join the magazine spring and follower by inserting the free end of the spring into the hole in the base of the follower. Click here for figure 1-26. With the slope of the follower pointing to the back of the magazine tube, insert the follower, spring, and retainer into the magazine tube. Click here for figure 1-27. Hold the magazine upside down with its back pressed against the palm of your hand. Slide the floorplate onto the tube from the front, pushing down on the retainer until the floorplate clears it. Click here for figure 1-25. Continue to push the floorplate until it is fully into position; make sure the retainer stud engages the hole in the floorplate.

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Chapter 1

Disassembling the Barrel and Slide

Key Features Click here for Figure 1-28a.

The following table lists the parts of the barrel assembly and their locations. You should know them before executing any disassembly or assembly actions. Part

Location

Barrel Locking Block Locking Block Plunger Locking Block Plunger Pin

Tools for Disassembly

Slide group Barrel Recessed in barrel Recessed in rear of barrel

You will need the following tools to remove the parts of the barrel: • Brass hammer • Punch • Bench block (Click here for Figure 1-28b.)

MCI Job Aid Inspection and Repair of the M9 Pistol

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Chapter 1

Removing the Locking Block, Plunger, and Pin

Removing the Locking Block Plunger Pin

The following table describes the steps to remove the locking block and plunger pin. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1 2

Removing the Locking Block Plunger and Locking Block

Action Place the right side of the barrel on the bench block. Click here for figure 1-29. Using a 1/16-inch punch, drive out the locking block plunger pin.

The following table describes the steps to remove the locking block plunger and locking block. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1 2

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Pull the locking block plunger from the rear of the barrel lug. Click here for figure 1-30a. While holding the barrel bottom side up, gently lift up on either lug of the locking block and slide it left or right out of the barrel. Click here for figure 1-30b.

1-14

Chapter 1

Removing the Extractor from the Slide

Removing the Extractor Pin

The following table describes the steps to remove the extractor pin. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. NOTE: Removing the extractor is tricky because the pin is staked in place and is in a slanted position in the slide. To position the punch properly, lean the punch against the side rail of the slide. Step 1 2 3 4 5

Removing the Extractor and Spring

Action Place the slide, bottom up, on the bench block. Click here for Figure 1-31. Using a starter punch, break the pin out of its staking. Strike the punch with one sharp blow from the hammer. Check the staking to make sure the pin has broken free from its staked metal. Once the pin is started, switch to a drive punch and finish removing the pin. Hold your thumb on the extractor as the pin clears the slide to prevent the extractor from suddenly flying out of the slide.

The following table describes the steps to remove the extractor and spring. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1

2

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Slowly remove your thumb from over the extractor. If the extractor doesn’t come out, push outward on the extractor hook and wiggle it until it releases. Click here for figure 1-32. Pull the spring from the recess.

1-15

Chapter 1

Removing the Firing Pin Block from the Slide

Position the Slide

The following table describes the steps to position the slide. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. NOTE: Remove the firing pin block before removing the firing pin and thumb safety. As with the rest of the slide, remove the firing pin block only to perform extensive cleaning or repair. Step 1

2

Removing the Retaining Pin

Action Rest the right side of the slide on the bench block with the thumb safety wing extended over the edge of the bench block. Click here for figure 1-33. Insert the punch from above into the retaining pinhole.

To remove the retaining pin, carefully drive the pin out with the punch. If the thumb safety does not need to be removed, drive the pin only far enough to release the firing pin block and leave the pin extending from the left side of the slide. However, if the thumb safety has to be removed, drive the pin completely out of the slide. In either case, leave the punch in the slide. NOTE: Leave the punch in the slide. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

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Chapter 1

Removing the Firing Pin Block from the Slide, Continued

Removing the Firing Pin Block and Spring

The following table describes the steps to remove the firing pin block and spring. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1 2 3 4

Action Turn the slide bottom side up. Place your finger on top of the block. Apply slight pressure and remove the punch. Click here for figure 1-34a. Ease up on your finger pressure and pull the block and spring from the slide. Click here for figure 1-34b. NOTE: Sometimes dirt and burrs will prevent the spring from pushing the block out. If so, turn the slide over and gently tap the block out from above with a punch.

MCI Job Aid Inspection and Repair of the M9 Pistol

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Chapter 1

Removing the Thumb Safety from the Slide

Removing the Right Thumb Safety Wing

The following table describes the steps to remove the right thumb safety wing. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. WARNING: Remove the firing pin block before removing the thumb safety. Step 1

2

3

Action Put the thumb safety ON and carefully look at the thumb safety wing on the right side of the slide. CAUTION: When removing the thumb safety from the slide, cover the rear of the slide with the palms of your hands as you work the safety out to prevent the loss of tiny detents and springs from both sides of the slide. Notice the two pins holding the wing to the safety. Drive out both pins downward from the top by placing the right side up on the bench block and driving the pins out with a 1/16-inch punch. Click here for figure 1-35a. Pull the wing straight out from the thumb safety. Click here for figure 1-35b. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

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Chapter 1

Removing the Thumb Safety from the Slide, Continued

Removing the Thumb Safety Lever from the Slide

CAUTION: When removing the thumb safety from the slide, cover the rear of the slide with the palms of your hands as you work the safety out to prevent the loss of tiny detents and springs from both sides of the slide. The following table describes the steps to remove the thumb safety lever. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1 2

3

4 5

6

7

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Rotate the thumb safety to the OFF position. Using a punch to push the firing pin striker in slightly, simultaneously rotate the lever up past the OFF position until you hear a “click.” Then, stop. Push very slightly with your index finger on the right side of the safety. Almost as soon as the safety moves, the safety detent and spring will pop forward near the safety wing on the left of the slide. Click here for figure 1-36. NOTE: Cover this area with your left palm as you push the safety with your right index finger. Once you have removed the safety detent and spring, begin pulling the safety out by the left safety wing. Click here for figure 1-37a. Keep your right palm over the right rear side of the slide. As the safety clears the first quarter inch, the trigger bar detent and spring will be released. NOTE: If the extractor has been removed, cover the rear of the slide to prevent the firing pin and spring from flying out in the first half-inch of movement. If the extractor has not been removed, pull the safety out far enough to clear the firing pin. The safety can now be totally removed from the slide. Once the safety is out of the pistol, pull the firing pin striker from the safety. Click here for figure 1-37b.

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Chapter 1

Removing the Firing Pin from the Slide

Removing the Firing Pin and Spring

Before removing the firing pin and spring from the slide, you must first remove the extractor, firing pin block, and thumb safety. Once they are removed, the firing pin and spring should pop out of the slide under spring pressure. Click here for figure 1-38. If dirt and carbon cause the firing pin to freeze up in the slide, follow the steps in the table below to remove the firing pin and spring. Step 1 2

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Apply a liberal amount of cleaner, lubricant, and preservative (CLP) to the firing pin area. Press in on the head of the firing pin several times with a punch to loosen the pin.

1-20

Chapter 1

Removing the Rear Sight from the Slide

Rear Sight Removal

The following table describes the steps to remove the rear sight from the slide. Normally, the sight needs to be removed only for replacement; however; it may have to be drifted left or right for windage adjustment. Remember: Always work in an organized manner. Step 1 2 3 4

Action Estimate as nearly as possible the center of the rear sight notch. With a pencil, mark the top of the slide in line with the center of the notch. Place the slide on the bench block, left side down. NOTE: The slot in the slide for the sight is dovetailed, so the sight must be removed from the right to left. Using a brass punch, drive the base of the sight out of the left side of the slide. Click here for figure 1-39.

MCI Job Aid Inspection and Repair of the M9 Pistol

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Chapter 1

SECTION 3. ASSEMBLING THE BARREL AND SLIDE Installing the Locking Block, Plunger, and Pin

Procedure

The following table describes the steps to install the locking block, plunger, and pin. The steps are the reverse of disassembly. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1

2

3 4 5 6 7

MCI Job Aid Inspection and Repair of the M9 Pistol

Action While holding the barrel bottom side up, gently slide the locking block from the left or right side of the barrel into position in the middle of the barrel. Click here for figure 1-30b. Slide the locking block plunger, curved end first, into the plunger hole at the rear of the barrel lug. Click here for figure 1-40. NOTE: Make sure the retaining pin cutout on the plunger is turned toward the chamber. Grasp the barrel in your left hand; with your index finger, press the locking block against the barrel. Push forward on the plunger to make sure there is free movement between the plunger and locking block. Look through the pinhole. Gently place the right side of the barrel onto the bench block. Drive the locking block plunger pin back into position. Make sure the ends of the pin are flush with or below the sides of the barrel lug. Click here for figure 1-41.

1-22

Chapter 1

Installing the Rear Sight onto the Slide

Procedure

The following table describes the steps to install the rear sight onto the slide. Remember the slot for the rear sight is dovetailed, so you must install the sight only from the left. Step 1 2 3 4

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Lay the slide on its right side on the bench block. With the half-moon cutout of the sight to the rear, use a brass hammer to start the sight into the sight slot. Once the sight is in halfway, use your brass punch to drift the sight home. Align the center of the sight notch with the pencil mark you made on the slide before you removed the sight.

1-23

Chapter 1

Installing the Firing Pin and Extractor in the Slide

Installing the Firing Pin and Spring

Remember that you removed the safety, firing pin block, and extractor before you could get the firing pin out. Assembly is easier if you install the firing pin and extractor at the same time; use the extractor pin to hold the firing pin in position as you finish assembling the slide. The following table describes the steps to install the firing pin and extractor into the slide. Step 1 2 3 4

5

Action Insert the extractor pin into its hole just far enough to hold it there. Place the firing pin spring on the firing pin. Insert the firing pin into the firing pin well with the cutout pointed to the right. Click here for figure 1-42. NOTE: Use the firing pin block to maintain the direction of the cutout as you install the extractor. Hold the firing pin block upside down and push in on the firing pin with a punch. Place the block into the cutout in the top of the slide to properly align the cutout and maintain the position of the firing pin when you install the extractor pin. Click here for figure 1-43. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-24

Chapter 1

Installing the Firing Pin and Extractor in the Slide, Continued

Installing the Extractor, Spring, and Pin into Slide

The following table describes the steps to install the extractor, spring, and pin into the slide. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2 3 4 5

6 7

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Position the extractor spring in its recess and place the extractor into its cutout. Click here for figure 1-44. Now, with one finger at the front of the extractor and one at the rear, push the extractor rearward and inward simultaneously. Maintaining pressure on the extractor, tap the extractor pin into position. If the pin hangs up, gently turn the extractor left to right while tapping until the pin enters the hole in the extractor. Once the pin has engaged the extractor, drive the pin in until its head rests against the bottom of the countersunk hole. Click here for figure 1-45. Remove the firing pin block. Complete the process by lightly staking the pin in place at two points (front and rear of the hole).

1-25

Chapter 1

Installing the Thumb Safety into the Slide

Positioning the Safety into the Slide

The following table describes the steps to position the safety into the slide. The steps are the reverse of disassembly. This procedure requires patience and care. Do not get frustrated if the detents fly out before you have them secured. Step 1 2 3

Action Insert the firing pin striker into its recess in the safety. Click here for figure 1-46. Hold the safety wing slightly up past the fire position. Slide the safety part way into the slide. Make sure the rear of the firing pin striker is still flush with the rear of the safety.

NOTE: Examine the three remaining springs needed for installation in the slide: the safety detent spring, the firing pin block spring, and the trigger bar detent spring. The trigger bar detent spring and the firing pin block spring are interchangeable and slightly smaller than the safety detent spring.

Positioning the Detents and Springs

The following table describes the steps to position the detents and springs. The steps are the reverse of disassembly. Step 1 2 3 4

Action Carefully put the largest spring (safety detent spring) into its recess in the safety. Click here for figure 1-47. Insert the safety detent into the spring. Place the trigger bar detent spring into its recess in the right side of the slide. Insert the trigger bar detent into the spring. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-26

Chapter 1

Installing the Thumb Safety into the Slide, Continued

Securing the Detents and Springs

The following table describes the steps to secure the trigger bar and safety detents and springs. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2

3

Installing the Right Safety Wing

Action With a punch, push down on the trigger bar detent and work the end of the safety over the detent until it is held in place. With the same punch, push in on the safety detent. Push the safety into the slide just enough for the detent to catch between the slide and safety. Rotate the wing all the way down to the safe position.

The following table describes the steps to install the right safety wing. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2 3

4

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Insert the right safety wing into its slot in the safety. Click here for figure 1-48. Insert a 1/16-inch punch into the pinholes in the safety and align the holes in the wing. Lightly tap both pins into the safety and through the wing until the pins are slightly below flush and do not protrude from either the top or bottom. Complete the installation by rotating the safety back and forth from SAFE to FIRE. Make sure it moves freely yet is positively retained by detent pressure in both positions.

1-27

Chapter 1

Installing the Firing Pin Block in the Slide

Procedure

The following table describes the steps to install the firing pin block into the slide. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2 3 4

5

6

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Start with the slide upside down on the bench block. Carefully fit the firing pin block spring into its recess. Place the firing pin block into the cutout. Click here for figure 1-49a. With your forefinger, push in on the block and hold the pressure while you rotate the slide onto its side. Click here for figure 1-49b Using a 1/16-inch punch, tap the firing pin block pin into place. Like most other pins, it should end up slightly below flush with the sides of the slide. Work the firing pin block in and out; check for binding.

1-28

Chapter 1

SECTION 4. DISASSEMBLING THE RECEIVER Removing the Grips

Key Features

The following table lists the parts of the receiver and their locations. You should know them before executing any disassembly or assembly actions. Part Bushings Disassembly Latch Lever Firing Pin Block Lever Grips Hammer Hammer Release Lever Headed Straight Pin Headed Trigger Pin Lanyard Loop Lanyard Loop Spring Pin Magazine Catch Assembly Sear Sear Pin Sear Spring Slide Stop Slide Stop Spring Trigger Trigger Bar Trigger Spring Washers

Location At the upper frame of the receiver On the left side of the receiver just above and forward of the trigger On the upper flat portion of the receiver On lower frame of the receiver At rear of pistol In the upper rear of the receiver frame At the rear of the upper portion of the receiver Just above the trigger within the receiver At bottom rear of pistol At the bottom rear of the pistol grip (same as solid pin) At the upper portion of the receiver frame behind the trigger guard In the upper rear of the receiver frame In the upper rear of the receiver frame In the upper rear of the receiver frame On the left side of the receiver just above the trigger Seated on a stem of the slide stop Within the trigger guard On the right side of the upper receiver just above the trigger Within the trigger housing Between the grip screws and grips Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-29

Chapter 1

Removing the Grips, Continued

Required Tools

The following table lists the tools needed to disassemble the receiver. You should know them before executing any disassembly or assembly actions. Part Easy Out Extractor Screwdrivers of various sizes

Grip Removal

Function Used to remove bushings Used to remove and install screws into pistol.

The following table describes the steps to remove the grips. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. The washers are small. Be careful not to lose them. Step 1

2 3

Action Use a screwdriver with the proper blade to remove both the upper and lower grip screws. Click here for figure 1-50. CAUTION: If a washer has become imbedded in the plastic of the grip, do not remove it except to replace the washer or grip. Place your finger into the magazine well. Click here for figure 1-51. Find the cutout in the side of the well and push the grip off. You may use a plastic mallet to gently tap loose grips that stick. CAUTION: Do not use a screwdriver or knife between the grip and the frame. It may crack or chip the grip or mar the receiver’s finish.

MCI Job Aid Inspection and Repair of the M9 Pistol

1-30

Chapter 1

Removing and Disassembling the Magazine Catch Assembly

Removing the Magazine Catch Assembly

The following table describes the steps to remove the magazine catch assembly. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step

1 2

3

Disassembling the Magazine Catch Assembly

Action If the magazine catch assembly button protrudes from the Left side (right-hand setup) Right side (left-hand setup) Hold the receiver in your right Hold the receiver in your left hand. hand. Push straight in on the right Push straight in on the left (flat) (flat) side of the catch assembly side of the catch assembly with with your index finger until the your index finger until the catch jumps up from its seat in catch jumps up from its seat in the frame. (Click here for figure the frame. (Click here for 1-52.) figure 1-52.) Pull the assembly from the receiver.

The following table describes the steps to disassemble the magazine catch assembly. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1

2

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Look inside the catch and observe the long and short bushings. Spring pressure holds the bushings in position. Click here for figure 1-53. Remove the short bushing. Using the tip of a small screwdriver to push the short bushing to the center of the catch, simultaneously push down on the inner portion of the bushing. The short bushing should spring from the bottom of the catch followed by the spring, and then the long bushing.

1-31

Chapter 1

Removing the Disassembly Latch Lever

Procedure

The disassembly latch lever is easily removed for cleaning and maintenance. NOTE: Repeated removal causes excessive wear to the receiver and reduces the weapon life. The following table describes the steps to remove the disassembly latch lever. Step 1 2 3

4 5 6

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Push the disassembly latch button in. Rotate the disassembly latch lever upward until it contacts the slide rail. Click here for figure 1-54a. While maintaining pressure on the button, pull out on the lever and rotate it upward until it points straight up. Click here for figure 1-54b. Pull the lever from the receiver. Ease up slowly on the button to prevent loss of the spring. Remove the button and spring. Click here for figure 1-54c.

1-32

Chapter 1

Removing the Trigger Bar

Trigger Bar and Spring

The following table describes the steps to remove the trigger bar spring. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1

2

3 4 5

MCI Job Aid Inspection and Repair of the M9 Pistol

Action CAUTION: Make sure the hammer is uncocked before removing the trigger bar spring. Hold the receiver in one hand. With a pair of needle-nose pliers, pull the upper leg of the spring down and then out to clear the groove in the trigger bar. Click here for figure 1-55. Lift up on the spring until the 90°-angled end releases from its retaining hole. Insert your index finger into the magazine well and push outward on the bar to unseat it. Once the bar is unseated, pull it straight out from the receiver. Click here for figure 1-56.

1-33

Chapter 1

Removing the Slide Stop

Slide Stop Removal

The following table describes the steps to remove the slide stop. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1

2 3 4 5

MCI Job Aid Inspection and Repair of the M9 Pistol

Action With your forefinger, carefully rotate the slide stop slightly upward until the end barely clears the top of the frame. Click here for figure 1-57. While maintaining the upward pressure, pull the slide stop gently outward (you may have to wiggle the stop a little). Once the lug on the stop clears the side wall of the receiver, release your upward pressure and let the stop swing down. Pull the slide stop straight out of the receiver. Click here for figure 1-58. Remove the slide stop spring.

1-34

Chapter 1

Removing the Trigger

Precautionary Notes

The slide stop spring holds the trigger pin in place. You must remove the slide stop and spring before removing the trigger pin. Cover the receiver cavity with the palm of your hand so you don’t lose the trigger pin during removal.

Removal Procedure

The following table describes the steps to remove the trigger. Remember: Always work in an organized manner. Lay the parts out as you remove them to make assembly easier and to keep from losing parts. Step 1 2 3

Action Use a 3/32-inch punch to push the headed trigger pin out from right to left. Click here for figure 1-59a. Remove the punch. Push upward on the trigger to remove the trigger and spring. Click here for figure 1-59b. NOTE: The trigger spring may have a bent leg on one or both ends. Either type is acceptable.

MCI Job Aid Inspection and Repair of the M9 Pistol

1-35

Chapter 1

Removing the Lanyard Loop and Mainspring

Lanyard Loop The following table describes the steps to remove the lanyard loop and and Mainspring mainspring. Removal

NOTE: Two types of lanyard loop pins are used to retain the loop in the receiver: a spring pin or a headed, solid pin. The headed solid pin is preferred, but either type is acceptable. CAUTION: Always make sure the hammer is uncocked before removing the lanyard loop. A cocked hammer places extreme tension on the mainspring. Step 1

2

3

4

5

MCI Job Aid Inspection and Repair of the M9 Pistol

Action for Removing Lanyard Loop With Spring Pin Solid Pin Lay one side of the receiver on a Hold the pistol in a horizontal bench block. Using a 1/8-inch position with the lanyard loop punch; drive the spring pin out of placed against the edge of your the receiver. Leave the punch in workbench. Click here for place. Click here for figure 1-60. figure 1-61. Pick up the receiver and place the Place the palm of your free hand lanyard loop against the top of your under the receiver to catch the workbench. pin when it falls out. Push down firmly on the receiver Press the receiver against the to compress the mainspring. workbench in a pumping motion. The pin should work its way out and fall into your palm. Remove the punch and slowly Ease up on the pressure against release the pressure on the the workbench. mainspring. Remove the lanyard loop. With the Remove the mainspring from lanyard loop removed, the the receiver. If the pin does not mainspring will fall out of its work its way loose, drift the pin recess. out with a punch as if it were a spring pin.

1-36

Chapter 1

Removing the Hammer

Hammer Removal

You must remove the trigger bar and grips before removing the hammer and strut. Although you don’t have to remove the mainspring to remove the hammer, doing so makes removing and installing the hammer much easier. The following table describes the steps to remove the hammer. Step 1 2 3 4

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Locate the hammer pin that retains the hammer. Use a punch to push the hammer pin out from right to left. Click here for figure 1-62. Pull the hammer straight up and out of the receiver. Turn the receiver over, and the hammer strut will drop from the pistol.

1-37

Chapter 1

Removing the Sear

Sear Removal

The following table describes the steps to remove the sear. Remember: Always work in an organized manner. Step 1 2 3 4 5

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Locate the sear pin in the frame. Click here for figure 1-63a. Drift the sear pin with a 3/32-inch punch. Before removing the punch, place your finger on the sear spring to prevent its loss. Remove the punch. Ease up on the spring and remove the sear and spring from the receiver. Click here for figure 1-63b.

1-38

Chapter 1

Removing the Hammer Release Lever, Firing Pin Block Lever, and Ejector

Removing the Hammer Release and Firing Pin Block Levers

The following table describes the steps to remove the hammer release lever and firing pin block. Remember: Always work in an organized manner. NOTE: Remove these parts only when they require replacement or repair. Perform extensive cleaning with the parts in place. Step 1

2 3

Removing the Ejector

Action Drive out the hammer release lever pin (headed straight pin) holding the two levers in place from right to left. Click here for figure 1-64. Lift the hammer release lever from the pistol. Remove the firing pin block lever by swinging the hooked lower arm inward until the arm clears the receiver wall.

The following table describes the steps to remove the ejector. Step 1 2

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Drift the ejector spring pin out of the receiver. Lift the ejector straight up and out of the receiver. Click here for figure 1-65.

1-39

Chapter 1

Removing the Grip Screw Bushings

NOTE: Be extremely careful when removing the grip screw bushings. Errors during the procedure could strip the threads in the pistol itself and render it irreparable. Because potentially serious damage could occur, never remove the grip screw bushings unless they require repair. Then, only remove them if you have the correct tools to remove and replace the bushings.

Grip Screw Bushings Removal

The following table describes the three steps to remove the grip screw bushings. Remember: Always work in an organized manner. Step 1

2 3

4

Action NOTE: Be careful; do not damage the bushing on the opposite side of the pistol as you come through to the inside of the magazine well. Insert a flat piece of aluminum or wood, half the thickness of a pistol magazine, into the magazine well for protection. Use an electric drill with a 1/8-inch drill bit to carefully drill through the center of the bushing. Place a number one easy-out extractor into the drilled out bushing. With a brass hammer, tap the extractor firmly (but not too hard) into place until its threads bite into the bushing. Click here for figure 1-66. NOTE: The easy-out extractor has sharp reverse threads. When you turn it, the threads bite deeply into the soft metal of the bushing, unscrewing the bushing from the receiver. With an adjustable wrench, slowly turn the easy-out extractor counterclockwise until the bushing comes out. Click here for figure 1-67.

MCI Job Aid Inspection and Repair of the M9 Pistol

1-40

Chapter 1

SECTION 5. ASSEMBLING THE RECEIVER Installing the Grip Screw Bushings

Key Features and Preparation

The following table lists the required parts and tools and important related information. You should know them before executing any disassembly or assembly actions. CAUTION: Do not substitute for items you do not have! Part Bushings Screwdriver Staking tool Torque wrench Solid film lubricant (in an aerosol can)

Important Related Information Use brand new bushings; old bushings cannot be used. Screwdriver tips must fit perfectly into the slot of the bushing to prevent damaging the bushings. Needed to stake the bushings. If you do not have one available, have your nearest machine shop make one. A 3/8-inch drive, inch-pounds torque wrench. Make sure it has been recently calibrated. Use on worn areas of the weapon’s finish. It provides a flat matte-gray finish to the areas where you apply it. You should let it cure overnight if possible. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-41

Chapter 1

Installing the Grip Screw Bushings, Continued

Grip Screw Bushings Installation

The following table describes the steps to install the grip screw bushings. NOTE: Be extremely careful when installing the grip screw bushings. Errors during the procedure could strip the threads in the pistol itself and render it irreparable. Do not take shortcuts. Just prepare and strictly follow the steps to produce the desired result. Step 1 2 3

4 5 6 7 8

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Using the screwdriver, snugly tighten the replacement grip bushing into the receiver. Do not overtighten! Insert the fabricated staking tool into the magazine well window. Click here for figure 1-68. Center the staking point on the bottom of the tool on the underside of the bushing and the recessed area of the capscrew over the bushing slot. Use the torque wrench to torque the capscrew to 110-115 inchpounds. Unscrew and remove the staking tool. With a fine file or stone, touch up any burred metal on the underside of the bushing in the magazine well. Insert a magazine to make sure it slides in and out of the well freely. Touch up any areas of bare metal with solid film lubricant.

1-42

Chapter 1

Installing the Ejector, Hammer Release Lever, and Firing Pin Block Lever

Installing the Ejector

The following table describes the steps to install the ejector. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1

Action NOTE: Install the rear part of the ejector first to help position it before you install the levers. Otherwise, you’ll have to align both the levers and the ejector with the pinhole to install the hammer release lever pin.

2 3

Position the ejector with the narrow tang portion to the front and slip the ejector into its recess. Click here for figure 1-69. Align the pinholes in the ejector with the corresponding holes in the receiver. Tap the ejector pin into place until it is slightly below flush with the receiver. Click here for figure 1-70. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-43

Chapter 1

Installing the Ejector, Hammer Release Lever, and Firing Pin Block Lever, Continued

Installing the Hammer Release Lever and Firing Pin Block Lever

The following table describes the steps to install the hammer release and firing pin block levers. If you laid out the parts in an organized manner during disassembly, reassembly should be easy.

Step 1

2

3 4

5 6 7 8 9

MCI Job Aid Inspection and Repair of the M9 Pistol

Action From the left, push the headed hammer release lever pin partially into the receiver, so the pin barely enters the forward pinhole in the ejector. Click here for figure 1-71. Place the hammer release lever with the curved arm up and to the rear into the middle recess in the receiver. Click here for figure 1-72. Push the headed pin in far enough to hold the lever in place. With the right angle foot of the firing pin block lever down and the tang pointing forward, tilt the lever to the right and slide it into its recess on the right side of the receiver. Click here for figure 1-73. When the foot of the lever clears the magazine well window cutout, tilt the lever into an upright position. Align the hole with the headed pin; tap the pin fully into the receiver. Stake the headed pin in place. Always stake at either the 9 or 3 o’clock positions in the center of the left rail. Using a fine stone, remove any metal pushed up into the rail track that would interfere with slide movement. Make sure both levers move freely.

1-44

Chapter 1

Installing the Sear and Spring

Sear and Spring Installation

The following table describes the steps to install the sear and spring. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2 3 4 5

6

7 8

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Start the sear pin into the right side of the receiver. Hold the receiver with the forward portion pointing upward and the backstrap of the grip down. Insert the sear through the magazine well window with the flat side up. Click here for figure 1-74. Slide the sear toward the ejector; then lower it into the sear cutout in the receiver. Align the hole in the sear with the hole in the receiver. Push the sear pin through that hole far enough to retain the sear. Use a pair of needle nose pliers to hold the sear spring. Place the spring into the well and in position on the left side of the sear in the sear recess. The short leg of the spring should point towards the ejector; the curved portion of the spring should face into the magazine well. Click here for figure 1-75. Once in the spring is in position, use a punch to push down on the spring coil. Force the sear pin into place all the way through the coil of the sear spring.

1-45

Chapter 1

Installing the Hammer

Two Installation Methods

Hammer installation, just like removal, is best done with the mainspring removed. Installation is twice as difficult with a mainspring installed.

With the Mainspring Removed

The following table describes the steps to install the hammer with the mainspring removed. Step 1 2 3 4 5

Action Lay the pistol on its right side. Insert the hammer strut into the hammer with the angled short leg pointing to the rear of the hammer. Click here for figure 1-76. Slide the hammer and strut into the receiver. Click here for figure 1-77. Align the hammer pin holes in the receiver with the hole in the hammer. Insert the headed hammer pin into the hole on the left side and force it in until the head is flush with the receiver. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-46

Chapter 1

Installing the Hammer, Continued

With Mainspring Installed

The following table describes the steps to install the hammer with the mainspring installed. Step 1

2 3

4 5

6

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Insert the long leg of the hammer strut into the receiver. Make sure that it fully enters the mainspring and the upper leg angles rearward. Click here for figure 1-78. Slide the hammer onto the hammer strut. Place your right thumb over the hammer spur. Wrap the fingers of your right hand around the frame: index and middle fingers in the trigger guard and remaining two fingers into the slide opening of the magazine well. Squeeze your hand closed to force the hammer and strut to compress the mainspring. Look through the left side of the hammer pin hole and continue squeezing until the hole in the frame aligns with the hole in the hammer. Insert the headed pin from left to right into the pin hole until it is flush with the left side of the frame. Sometimes you may have to alternately increase and decrease pressure on the hammer to jockey the pin into position.

1-47

Chapter 1

Installing the Mainspring and Lanyard Loop

Installing the Mainspring

The following table describes the steps to assemble the mainspring. NOTE: Before installing the mainspring, make sure the hammer is uncocked. Overcoming the spring resistance of a cocked hammer is difficult, if not impossible. Step 1

2

Lanyard Loop

Action Hold the pistol on its side and slide the mainspring into its well at the bottom of the frame. The tricky part of this operation is trying to wrangle the hammer strut into position inside the spring coils. Click here for figure 1-79. While gently pushing on the spring, tilt the pistol back and forth and side to side until the strut falls into position and the spring slips easily into the receiver.

You may encounter two differently styled lanyard loops, referred to as symmetrical and nonsymmetrical. Click here for figure 1-80. Either loop is acceptable for use in the pistol. NOTE: Before installing the lanyard loop, make sure the hammer is uncocked. Overcoming the spring resistance of a cocked hammer is difficult, if not impossible.

Symmetrical Lanyard Loop

To install the symmetrical lanyard loop, simply insert it into the frame. Click here for figure 1-81.

NonSymmetrical Lanyard Loop

The nonsymmetrical lanyard loop has a front and rear and needs to be positioned accordingly. You will notice the cutout for the hole is cut higher on one side than on the other. The high side is the front part of the lanyard loop and should be positioned facing towards the muzzle of the pistol. Click here for figure 1-82. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-48

Chapter 1

Installing the Mainspring and Lanyard Loop, Continued

Installing the Lanyard Loop Pin

The two different types of lanyard pins, spring pin and shoulder solid pin, require two different methods of disassembly as well as two different methods of assembly. Either pin is acceptable for reuse in the pistol; however, the shouldered solid pin is the preferred replacement. The following table describes the steps to install both the spring pin and the shouldered solid pin. Action

Step 1

2 3

4

5

MCI Job Aid Inspection and Repair of the M9 Pistol

Spring Pin You must have a 1/8-inch punch available for use. With the lanyard loop installed into the pistol, rotate the pistol upright. Rest the lanyard loop against a hard surface. Push down on the receiver and compress the mainspring until the pin hole in the loop aligns with the pin hole in the receiver. Insert the punch halfway into the pin hole in the loop to keep the loop in position.

Shouldered Solid Pin With the lanyard loop correctly placed in the receiver, turn the receiver right side up.

Rest the lanyard loop on your workbench. Push down on the receiver from above until the pin hole in the loop aligns with the pin hole in the receiver. Slide the shouldered pin into the hole until it is flush or slightly below flush with the receiver. Drive the pin into place from the Ease up on your downward opposite side of the receiver until pressure to let the mainspring it is slightly below flush. Click pressure lock the pin into here for figure 1-83. place. Click here for figure 1-84.

1-49

Chapter 1

Installing the Trigger and Trigger Bar

Trigger Description

The trigger may have either one or two bent legs; you may use either trigger. The trigger has two holes in it. The lower hole is for the trigger pin; the upper hole is for the post of the trigger bar. Click here for figure 1-85a.

Installing the Trigger

To install the trigger, place it down into the receiver and insert the trigger pin from left to right. Do not push the pin in all the way; just use it to hold the trigger in its position so the trigger bar can be installed. Click here for figure 1-85b.

Installing the Trigger Bar

The following table describes the steps to install the trigger bar. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1

2

Action Insert the trigger bar post through the oval slot in the receiver and into the upper hole of the trigger. Click here for figure 1-86. At the same time, insert the lug of the bar into the cutout on the right side of the receiver. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

1-50

Chapter 1

Installing the Trigger and Trigger Bar, Continued

Installing the Trigger Spring

The following table describes the steps to install the trigger spring. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2

3 4 5 6

Action Hold on to the coil of the trigger spring with a pair of needle nose pliers. Click here for figure 1-87. If the spring has • Only one bent leg, that leg should point to the rear. • Two bent legs, point either leg to the rear. Lower the spring into the middle of the trigger. Make sure the bent leg rests on the trigger bar post. Remove the pliers. With a screwdriver, push down on the coil of the spring until it is positioned so you can push the trigger pin through it. NOTE: If you pushed the pin in too far earlier, you will have to partially withdraw it until the coil of the trigger spring can enter the middle of the trigger. Once the trigger pin is through the coil, push it in all the way. Click here for figure 1-88.

Installing the Trigger Bar Spring

The following table describes the steps to install the trigger bar spring. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. 1

2 3

MCI Job Aid Inspection and Repair of the M9 Pistol

With needle nose pliers, hold on to the trigger bar spring and install the 90°-angle end of the spring into the spring retaining hole in the receiver cutout. Click here for figure 1-89. Place the loop portion (rounded) into the spring groove of the receiver cutout. Using a screwdriver or needle nose pliers, pull down on the upper leg of the spring until you can slide the rounded end of the spring into position in the spring groove on the underside of the trigger bar.

1-51

Chapter 1

Installing the Slide Stop

Slide Stop Installation

Be careful when installing the slide stop because its spring serves double duty. The slide stop spring • Provides the stop with spring tension • Helps retain the trigger pin in place by keeping the pin from vibrating out. The following table describes the steps to install the slide stop. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2 3 4 5

6

7

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Place the slide stop post through the coil in the slide stop spring. Rest the straight leg of the spring in the cutout on the lug on the backside of the slide stop. The spring’s bent leg will point down. Start the post into the slide stop hole in the receiver. Once the post is started into the receiver, use a small screwdriver to lever the bent leg of the spring up into the slide. Guide the bent leg into the hole in the bottom of the cutout. The end of the bent leg should protrude through the bottom of the hole against the head of the trigger pin. It will retain the pin in position. Click here for figure 1-90. Push up on the stop, rotating it in a counterclockwise direction, until it is about 45° above horizontal. Click here for figure 1-91. Push in on the slide stop; it should seat against the frame.

1-52

Chapter 1

Assembling and Installing the Magazine Catch Assembling the Magazine Catch

Before assembling the magazine catch, study it carefully. Look inside the catch button of the catch pointing to the left and see how the little square or window that passes through the catch is slightly offset from the center. To the left of the window, the ledge is longer than the ledge to the right. The following table describes the steps to assemble the magazine catch. Step 1 2 3 4

5

Installing the Magazine Catch

Action Hold the catch in your left hand with the button toward the left. Insert the long bushing into the catch through the window from below. Slide the bushing to the left and support it with your left index finger. Insert the short bushing onto the spring. With your thumbnail or screwdriver on the outward edge of the short bushing, compress the spring in. When the slanted edge of the bushing clears the window, push the bushing into the window until you hear a sharp click. That click means the bushing has engaged and assembly of the catch is complete.

You can install the magazine catch to fit either left- or right-hand shooters. The only difference is the direction the button points. The following table describes the steps to install the magazine catch. Step 1 2

3 4

MCI Job Aid Inspection and Repair of the M9 Pistol

Action Hold the pistol in your left hand, muzzle end pointing down, so you can see into the magazine well cutouts. Tilt the catch downward and insert the button end (pointing to the right for left-hand use and to the left for right handers) into the catch cutout. Click here for figure 1-92. NOTE: The long bushing in the catch must engage the edge of the cutout. Once the bushing engages, push in on the flat (non-button) side of the catch to compress the catch spring. When the spring is compressed, push down on the flat side of the button until it slips into the catch cutout and snaps into place.

1-53

Chapter 1

Installing the Disassembly Latch Lever and Grips

Installing the Grips

The following table describes the steps to install the grips. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. Step 1 2 3 4 5

6

Installing the Disassembly Latch Lever

Action Place the grips over the grip bushings. Push down on the grips until the underside is flush against the sides of the magazine well. Click here for figure 1-93. With the pistol lying on either side, place the lockwashers over the bushings on the side of the pistol facing up. Screw both grip screws into place. Tighten the grip screws only until they are snug. CAUTION: Overtightening will strip the screw heads and threads or crack the grips. Once one side is completed, flip the pistol and install the grip on the opposite side in the same manner.

The following table describes the steps to install the disassembly latch lever. If you laid out the parts in an organized manner during disassembly, reassembly should be easy. 1 2 3 4

5 6

MCI Job Aid Inspection and Repair of the M9 Pistol

Place the disassembly button spring into the spring recess hole located at the right front of the receiver. Place the disassembly button into the hole going through the receiver. Click here for figure 1-94. Push the button in firmly with your forefinger and hold the spring and button in place. While still holding the button, insert the disassembly lever with its wing pointing up into the receiver from the left. Click here for figure 1-95. Apply pressure to the button until the groove on the button’s stem end protrudes through the left side of the receiver. Rotate the wing of the disassembly lever clockwise until the halfmoon cutout on the lever engages the groove on the stem of the button. Click here for figure 1-96.

1-54

Chapter 1

CHAPTER 2 TROUBLESHOOTING, INSPECTING, AND REPAIRING THE M9 PISTOL Functioning Cycle

Eight Steps

Before you can troubleshoot any weapon, you must know what occurs during operation. The functioning cycle consists of eight steps: • • • • • • • •

Feeding Chambering Locking Firing Unlocking Extraction Ejection Cocking

MCI Job Aid Inspection and Repair of the M9 Pistol

2-1

Chapter 2

Feeding

Manual Feeding

Although you can start anywhere in the functioning cycle and walk through the steps in order, the most logical starting point is the feeding step. Feeding begins either manually or mechanically. You may need to perform the manual feeding steps to chamber the first round. The following table describes the steps in the manual feeding process. Step 1 2 3

4 5

6

Description With your shooting hand, grasp the pistol by its grips. With your non-shooting hand, insert a loaded magazine into the magazine well until it locks in place. If the slide is • Locked to the rear, simply press down on the slide catch with your shooting thumb. The round protruding from the magazine is pushed into the chamber. Stop, the feeding process is complete. Click here for figure 2-1. • Forward, go to step four. Grasp the slide by the ridge lines with your non-shooting thumb and forefinger. Pull the slide to the rear until it stops. Click here for figure 2-2. NOTE: As the face of the slide clears the magazine, the top cartridge moves into the same position as if the slide was locked to the rear. Release your grip on the slide and let it move forward under its own power. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-2

Chapter 2

Feeding, Continued

Mechanical Feeding

The mechanical process occurs during recoil from firing a round. The process happens as if the slide were forward and pulled to the rear manually, only faster and without action from the shooter. The following table describes the steps in the mechanical feeding process. Stage 1

2

3

4

MCI Job Aid Inspection and Repair of the M9 Pistol

Description As the slide moves forward under pressure from the compressed recoil spring, the front of the stripping rib catches the rim of the top cartridge. Click here for figure 2-3. The force of the recoil spring pushes the round straight forward. As the cartridge moves forward, its rounded tip meets the inclined feed ramp on the receiver. Click here for figure 2-4. The bullet tip inclines up toward the chamber of the barrel. The magazine lips still restrain the rear of the cartridge, but now, the tip of the round contacts the feed ramp that directs the bullet into the barrel. Click here for figure 2-5. As the slide continues to move forward, the rim of the cartridge finally clears the magazine lips. The magazine spring continues to push the follower and any remaining cartridges upward. This has the effect of kicking the rear of the cartridges up into alignment with the barrel, completing the feeding process.

2-3

Chapter 2

Chambering

Process

The following table describes the chambering process. Stage 1 2

3

4

MCI Job Aid Inspection and Repair of the M9 Pistol

Description As the cartridge kicks free of the magazine and aligns with the barrel, the rear of the cartridge rides up the face of the slide. The rear of the cartridge then moves into the cartridge head closure (half-moon cutout) on the slide face. Click here for figure 2-6. The cartridge head enclosure guides the rim of the cartridge behind the extractor hook, pushing the extractor outward and compressing the extractor spring. The chamber-loading indicator is now visible. The slide continues forward until the face of the slide meets the recoiled barrel. The round is now fully chambered.

2-4

Chapter 2

Locking

Process

Once chambering is completed, locking begins. The following table describes the locking process. Stage 1

2

3

4

MCI Job Aid Inspection and Repair of the M9 Pistol

Description When the slide meets the barrel, they both begin to move forward as one unit. As they move forward, the cam lug of the locking block is forced against the cam support block of the frame. This forced motion smoothly and gradually lifts the lugs of the locking block into the cutouts in the slide. Click here for figure 2-7. Then, the bottom of the locking block reaches the top of the frame’s cam support block, and the locking lugs are fully engaged into the slide. At this point, continued forward motion pushes the locking block plunger cam against the beveled portion of the locking block plunger, forcing the plunger away from the locking block. Click here for figure 2-8. The flat rear area of the plunger protrudes from the rear of the barrel; at this point, the barrel and slide are locked up.

2-5

Chapter 2

Firing

Two Methods

Firing may be done either single or double action. Single action occurs when the hammer is already to the rear before the shooter pulls the trigger. Double action begins with the hammer at rest against the slide. When the shooter squeezes the trigger, the hammer first moves rearward before falling forward. NOTE: The advantage of single action is that it makes for a shorter, crisper, and lighter trigger pull than double action.

Single Action Firing

The following table describes the process of single action firing. Stage 1

2

3

4

5

Single Action Description As the shooter squeezes the trigger, it rotates around the trigger pin. The post of the trigger bar, engaged with the post hole in the upper part of the trigger, pulls the trigger bar forward. Click here for figure 2-9. As the trigger bar is pulled forward, the trigger bar lug contacts the sear cross bar, pushing the sear forward. Click here for figure 2-10. The sear rotates around the sear pin, compressing the sear spring and pulling the nose of the sear out of the hammer’s full cock notch. The shooter’s finger continues to travel rearward a short distance before stopping. Click here for figure 2-11. The hammer strut compresses the mainspring as the sear nose cocks and holds the hammer. Without the sear engaging the hammer’s full cock notch, the mainspring expands against the hammer strut. Click here for figure 2-12. The strut, resting in the lower rear of the hammer, forces the head of the hammer forward against the firing pin. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-6

Chapter 2

Firing, Continued

Double Action Firing

The following table describes the process of double action firing. Stage 1

2

3 4

5

6

Double Action Description As the shooter squeezes the trigger, it rotates around the trigger pin. The post of the trigger bar, engaged with the post hole in the upper part of the trigger, pulls the trigger bar forward. Click here for figure 2-9. The trigger bar lug engages the double action notch on the bottom of the hammer. As the trigger bar moves forward, the lug pulls against the double action notch of the hammer causing the hammer head to rotate away from the slide. Click here for figure 2-10. As the hammer rotates rearward, the hammer strut moves down compressing the mainspring. As the hammer continues to move to the rear and the half cock notch passes above the sear nose, the sear spring swings the sear in against the hub of the hammer. The sear is now ready to stop the hammer from falling should the shooter release the trigger before pulling it completely to the rear. When the hammer has traveled far enough to the rear, the lug of the trigger bar contacts the crossbar on the sear, rotating the sear nose forward enough to clear the cock notches on the hammer. The trigger, at this point, slips off the double action notch. The mainspring is now free to expand allowing the hammer head to travel forward. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-7

Chapter 2

Firing, Continued

Completing the Firing Process

The remainder of the firing cycle is the same for both single and double action. The following table describes the completion of the firing process. Stage 1

2 3 4

5 6 7 8

MCI Job Aid Inspection and Repair of the M9 Pistol

Description During trigger pull, the disconnector arm of the trigger bar meets the lower arm hook of the firing pin block lever rotating the firing pin block lever counterclockwise around its pin. Click here for figure 2-13. The upper arm of the lever lifts the firing pin block up out of the way of the firing pin before the hammer is released. The head of the hammer coming forward strikes a sharp blow to the firing pin striker protruding from the rear of the slide. The striker, being in line with the firing pin, moves forward against the rear of the firing pin and applies its forward energy to the firing pin. The firing pin then strikes the primer of the cartridge. The impact of the firing pin ignites the fast burning chemical in the primer. The primer flash then ignites the propellant powder in the cartridge case. Rapidly expanding gases from the burning powder force the bullet down the bore of the barrel and start recoil, completing the firing process.

2-8

Chapter 2

Unlocking

Process

The barrel needs to be locked for a short time to give the bullet time to leave the barrel. If the barrel were not locked, much of the projectile's energy would be lost to recoil before the projectile could leave the barrel. Remember, during locking, pressure from the recoil spring holds the barrel and slide unit forward. The following table describes the unlocking process. Stage 1

2 3

4

5

MCI Job Aid Inspection and Repair of the M9 Pistol

Description When the weapon fires, the barrel and slide move slightly rearward bringing the rear face of the locking block plunger into contact with the back wall of the locking block cavity within the frame. The barrel and slide, still locked together, continue rearward. The locking block begins to clear the rear of the cam support block. As the locking block clears, the beveled portion of the locking block plunger forces the locking block down into the locking block cavity. The locking lugs are withdrawn from the lug recesses in the slide; the support lug on the barrel meets the rear wall of the locking block cavity, halting rearward movement of the barrel. The slide, unlocked from the barrel, continues its rearward movement thus completing the unlocking process.

2-9

Chapter 2

Extraction and Ejection

Extraction

If you were to look at the pistol while it is firing, extraction and ejection would appear to be one single, smooth movement. In reality, they are two separate actions. The following table describes the extraction process. Stage 1

2

3

Ejection

Description The burning gases from firing force the head of the cartridge case against the face of the slide and cause the case to expand against the walls of the chamber, forming a tight seal. The extractor hook locks over the rim of the cartridge during chambering. As the slide unlocks from the barrel and continues to the rear, the extractor hook pulls the case from the chamber. Once the case clears the rear of the chamber, extraction is complete.

The following table describes the ejection process. Stage 1 2

3

MCI Job Aid Inspection and Repair of the M9 Pistol

Description With the extractor holding the rear of the case against the slide face, the slide continues rearward. The lower left edge of the cartridge case hits the tang on the ejector sharply. This causes the cartridge case to pivot to the right and up until the rim of the cartridge case slips from underneath the extractor hook. Click here for figure 2-14. The cartridge case continues up and out through the ejection port of the slide until it clears the pistol. Ejection is complete.

2-10

Chapter 2

Cocking

Process

After you have sent a round down range to your target, the final step of the functioning cycle prepares the weapon to send another round down range. Many actions take place between the slide and receiver during the cocking stage.

Actions of the Slide

The following table describes actions of the slide. Stage 1 2

3 4

5

6

Slide Action Description After the firing pin has struck the primer of the cartridge, forward movement of the firing pin stops. The firing pin spring, compressed as the firing pin went forward, begins to expand, drawing the firing pin back into the firing pin recess in the slide. The firing pin forces the firing pin striker back against the safety. The slide's recoil pushes the head of the hammer far enough away from the slide for the firing pin striker to protrude from the rear of the slide. As the firing pin settles into its rearward position, the firing pin block is free to move into the position it occupied before firing, thus blocking the firing pin's movement. The firing pin block spring forces the block into the firing pin cutout. The actions inside the slide are complete, but movement of the slide itself now causes actions to occur within the receiver. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-11

Chapter 2

Cocking, Continued

Actions of the Receiver

The following table describes actions of the receiver. Stage 1

2

3 4

5 6 7

8 9 10

MCI Job Aid Inspection and Repair of the M9 Pistol

Receiver Action Description After trigger pull but before recoil, the trigger bar spring lifts the trigger bar's disconnector arm into the disconnector cam slot in the slide rails. As the slide recoils, its disconnector cam depresses the disconnector arm of the trigger bar and disengages the trigger bar pull lug from the cross bar on the sear. The compressed sear spring rotates the nose of the sear rearward against the hub of the hammer. The sear is now in a position to grasp either the half cock notch (if for some reason recoil is not completed) or, ultimately, the full cock notch. As the slide moves to the rear, it pushes the upper portion of the hammer with it, causing the hammer to pivot on its pin. The sear nose clicks into position against the hammer hub to grab the full cock notch. The slide continues to the rear eventually passing over the hammer as the hammer rotates out of the way. The bottom of the slide holds the hammer in this position. The slide reaches full rearward travel and stops. The recoil spring, compressed during recoil, now begins to expand, reversing the rearward travel of the slide and sending it forward. As the rear of the slide passes the top of the hammer, the hammer is free to move forward under pressure from the mainspring until the full cock notch engages and is held by the sear nose. Cocking is now complete, and the cycle may start all over again.

2-12

Chapter 2

Diagnosing the Causes of Malfunctions Failure to Feed

Diagnosing Malfunctions

When a malfunction occurs, you will need to know where in the functioning cycle it happened. The malfunction may have several causes. Your task is to diagnose the correct cause using many different indicators (little hints) that will prove invaluable to you. When a failure to feed occurs, the most likely suspect is the magazine. Problems with the magazine can be traced to three different sources: the magazine itself, the ammunition, or shooter error.

Magazine Related Failure

Use the following table to diagnose magazine-related failure to feed malfunctions. Specific Problem

Check for Weak magazine catch spring Worn magazine catch Magazine fails to seat Bent or burred magazine cutout Click for figure 2-15. Damaged magazine Magazine seated, but no spring Bent follower round in chamber Dented magazine Lips on magazine too Round jammed at ramp tight Click for figure 2-17. Round jammed at Lips on magazine too chamber edge open Click for figure 2-18. Double feed

Repair or Replace Magazine catch spring Magazine catch

Magazine Click for figure 2-16.

Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-13

Chapter 2

Failure to Feed, Continued

Ammunition Related Failure

The M9 pistol is designed to fire 9mm NATO parabellum ball ammunition. Match grade and other approved ammunition can also be fired. Click for figure 2-19. Look for the following causes of malfunctions: • • •

Shooter Related Failure

Dented bullet noses. Projectiles pushed back too far in the cartridge. Cases out of round (rolling of the crimped groove designed to seat the projectile in the case).

The shooter (operator) is responsible for operating the weapon correctly. The following shooter errors could cause feeding failure: • • • •

Failing to seat the magazine all the way. Improperly filling the magazine. Misaligning the rounds by dropping a filled magazine. Slamming the magazine into the magazine well with excessive force.

The shooter is also responsible for cleaning the weapon. To verify cleaning has been done, always check for cleanliness and lubrication. Dirt, carbon, and rust in the magazine will cause it to malfunction. A filthy magazine well or magazine catch may also fail to give optimum results during feeding.

Weapon Related Failure

The bullet may not feed correctly due to problems with the weapon itself. • In the barrel, a damaged or burred feed ramp will cause the bullet nose to jam or fail to slide up properly. Click here for figure 2-20. • The chamber entrance to the barrel may be burred or cracked, thereby stopping the round. • A bent extractor hook, burred slide face, or burred extractor hook cutout will prevent the head of the round from seating against the slide face.

MCI Job Aid Inspection and Repair of the M9 Pistol

2-14

Chapter 2

Failure to Chamber or Lock

Diagnosing Chamber or Lock

A pistol’s failure to go fully forward into battery (slide fully forward) may be due to malfunctions in either of two steps in the functioning cycle. Careful examination will reveal whether the problem lies in chambering or locking.

Failure to Chamber

Use the following table to diagnose chamber-related malfunctions.

When failure occurs… and the shooter… during first round,

at any round

Failure to Lock

allowed the slide to go home properly

the probable cause of failure is… shooter eased (rode) the slide home. weak recoil spring. bent, dirty, or dented cartridges. burred receiver rails. Click here for figure 2-21a. burred slide. Click here for figure 2-21b. bulged barrel.

A failure to lock occurs when the weapon does not go fully into battery due to a failure in the locking components. Once you have discounted any of the previous causes of failure to chamber, investigate failures to lock. Check for burrs, cracks, or dirt in the following locking parts: • • • •

MCI Job Aid Inspection and Repair of the M9 Pistol

Locking block and support (Click here for figure 2-22a.) Shoulders of the cam support block The fore-end of the locking block The cam lugs and lug cutouts in the slide (Click here for figure 2-22b.)

2-15

Chapter 2

Failure to Fire

Diagnosing Failure to Fire

Failure to fire is due to one of three parts: the hammer, firing pin, or cartridge.

Failure of the Hammer

Use the following table to help diagnose hammer-related malfunctions. Shooter pulls trigger and hammer does not fall. hammer falls to half-cock. hammer falls lightly.

Failure of the Firing Pin

No round is fired because of improperly connected trigger bar. trigger bar dragging due to dirt. trigger bar binding against a warped or overtightened grip. broken trigger bar or trigger bar spring. burred sear or hammer notch. Click here for figure 2-23. worn trigger bar. Click here for figure 2-24. dirt in the frame. worn hammer spring.

The firing pin or the related components (click here for figure 2-25) can cause a failure to fire: • • •

Dirt or burrs on either side of the firing pin or striker could cause enough binding to prevent their free movement. The safety may not have been turned to its full OFF position. The hammer could still fall, but the striker would not be in line with the firing pin. Finally, if the firing pin block lever was damaged, it would not move the firing pin block out of the firing pin’s path. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-16

Chapter 2

Failure to Fire, Continued Failure of the Cartridge

Failures to fire due to the cartridge include no fires, hang fires, slam fires, and punctured primers. Hang fires are often mistaken for misfires. Use the following table to help identify cartridge-related malfunctions. Type of Failure Description No fire The firing pin strikes the cartridge with sufficient force to dent the primer, but nothing happens. The cause is missing or defective powder or primer Hang fire When struck, the primer burns slowly, delaying the expulsion of the projectile instead of it being nearly instantaneous. The powder is either wet or defective.

Slam Fire

WARNING: A hang fire occurs when detonation of the round is delayed. In this case, the round is faulty. Keep the weapon pointed downrange for one minute and your hands away from the recoiling slide. A slam fire occurs when the slide goes forward, setting off the round without the shooter pulling the trigger or the hammer having fallen. The cause may be • A primer protruding too far from the cartridge case • The firing pin protruding from the firing pin hole • Dirt or residue in the firing pin hole making the firing pin stick in the forward position If the firing pin catch is •

Up, the firing pin or striker are probably stuck in place with powder or residue. • Down, then the firing pin is broken. A piece of the firing pin is free to slide forward and strike the primer as soon as the round chambers and stops moving forward. Punctured primer May be distinguished from a normal primer by having a split or hole instead of a dent in the primer due to a primer defect or an enlarged firing pin hole that allows the firing pin to protrude too much. Punctured primers usually burn the tip of the firing pin to a sharp point that in turn causes more punctured primers.

MCI Job Aid Inspection and Repair of the M9 Pistol

2-17

Chapter 2

Failure to Unlock, Extract, and Eject

Diagnosing Failure to Unlock, Extract and Eject

As was the case with chambering and locking, the distinctions between unlocking, extraction, and ejection may also be blurred. You may have to examine all the areas associated with all three failures to discover the cause of a malfunction during these cycles of functioning. Use the following table to help identify unlocking, extracting, and ejecting-related malfunctions. Failure to Unlock

Extract

Probable Cause Broken locking block plunger (click here for figure 2-26). Foreign matter in lug recess Defective cartridge Insufficient powder in cartridge Dirty extractor Broken or worn extractor (click here for figure 2-27). Pitted chamber causing cartridge to stick (click here for figure 2-28). Short recoil (Insufficient powder) WARNING:

Eject

MCI Job Aid Inspection and Repair of the M9 Pistol

If the pistol has a short recoil due to insufficient powder in the cartridge, examine the bore of the barrel. Often the projectile lodges in the barrel because there is insufficient force to expel it from the weapon. Broken ejector (click here for figure 2-29).

2-18

Chapter 2

Failure to Cock

Diagnosing Failure to Cock

The last process in the cycle is cocking. The slide forces the hammer to the rear where it should remain until the trigger is pulled, unless the safety is engaged. Use the following table to help identify failure to cock malfunctions. Action

Hammer rides the slide home.

Hammer falls after slide goes home.

Trigger stays retracted.

MCI Job Aid Inspection and Repair of the M9 Pistol

Probable Cause Dirty hammer notch (click here for figure 2-30a). Broken or weak sear spring (click here for figure 2-30b). Bent or damaged sear pin (click here for figure 2-30c). Worn or damaged sear nose (click here for figure 2-30d). Worn or damaged hammer notch Worn hammer notch Worn sear nose Weak sear spring Dirt in trigger or locking lug cavity (click here for figure 2-31a). Broken trigger spring (click here for figure 2-31b). Warped or overtightened pistol grip (click here for figure 2-31c).

2-19

Chapter 2

Inspecting the M9 Pistol Types of Inspections

Operator Inspections

Operators are not exempt from inspecting their weapons simply because they have not attended a formal school for weapon repair. Besides making sure that the weapons will perform as expected, these inspections also help armorers with their jobs. The following table describes the three operator inspections. Inspect for

Description Conduct weekly if the weapon is not being used and remains in the armory; in the field, conduct more frequently. Cleanliness A clean, well-lubricated pistol will reduce friction and heat, thus prolonging weapon life and reducing the chance for stoppages. Constantly inspect the parts for cleanliness and wear when Serviceability the weapon is field stripped and identify for the armorer any areas that could develop trouble. During firing, observe how the weapon is functioning. Firing Report any troubles to the armorer. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-20

Chapter 2

Types of Inspections, Continued

Unit Inspections

A unit armorer performs a limited technical inspection (LTI) of an M9 pistol on five occasions. An LTI will be limited only by the tools and gauges available and by any publications defining the extent of work second echelon maintenance are authorized to do. The following table describes unit armorer inspections. Inspect

Upon receipt

When issuing When turned in

Pre-fire Upon command

When received Description of inspection from Intermediate Check repairs requested and make sure support unit subsequent assembly is complete. Make sure weapon is clean, lubricated, Supply channel/ and serviceable and all required storage facility modifications are completed. Check for serviceability. Shooter after Identify defects or conditions that firing could cause defects. Identify, within capabilities, all defects Unit for repair aware of before delivery. Conducted before pistol qualification. Make sure weapon is safe to fire. Any officer within your chain of command or designated representative may direct an armorer to inspect. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-21

Chapter 2

Types of Inspections, Continued

Intermediate Support Inspections

The intermediate organization performs two basic types of inspections: repair or pre-/post-deployment. These inspections are performed at the request of the using unit. Type

Phase Initial

Repair

In-process

Final

Pre-/PostDeployment

MCI Job Aid Inspection and Repair of the M9 Pistol

2-22

Description Performed when the weapon is admitted into the shop. A complete inspection (cleanliness, serviceability, and gauging) performed to identify all defects. Performed while correcting defects found in the initial phase. Detailed inspection of springs, pins, threads, and surfaces. Performed before releasing weapon to using unit. A complete check to make sure all reported defects have been repaired. Inspector may also inspect critical areas for quality control. Performed before deployment to make sure the weapon can withstand 90 days of daily firing and meet minimum standards often stricter than those for weapons used in the U.S. Also performed on weapons returning from deployment.

Chapter 2

Steps for Conducting an Inspection

Clear the Weapon!

As always, clearing the weapon is the first step any time you handle a weapon. To clear the pistol, first put it on safe, remove the magazine, lock the slide to the rear, and inspect the chamber for ammunition. Click here for figure 2-32.

Visually Inspect the Assembled Pistol

Look the weapon over from muzzle to lanyard loop. First examine one side, then the other, the top and the bottom. The following table is a guide to inspect the weapon. Item Cleanliness Legibility Finish Assembly

Modifications

Inspect for Dirt, carbon, rust, or excess oil that may hide finish deterioration, cracks, pits, and other flaws. If the weapon is not clean, you cannot perform a proper inspection. The serial number, manufacturer, and model number must be clearly stamped on the frame. Exterior metal surfaces ranging from jet black to light gray. Small uncoated areas are acceptable as long as they do not reflect light (shine). Missing parts or improperly assembly. Any permanent alteration of a weapon is a modification. Authorized modification instructions (MIs) from HQMC are the only authorized modifications.. Notify your ordnance officer of unauthorized or improper modifications.

Conduct a Function Test

Do a walk through check of the safety features. Make sure the safety devices are operating properly. Operate the slide and pull the trigger.

Gauge the Weapon

Perform the trigger pull checks. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-23

Chapter 2

Steps for Conducting an Inspection, Continued

Visually and Manually Inspect the Groups and Parts

Assemble the Pistol

Field strip the weapon and look at all areas and moving parts. Do not forget the magazines. •

Visual: Inspect in a well-lighted area. Natural light is best. Use a jeweler’s loupe (Click here to see figure 2-33a) or hand magnifier (Click here to see figure 2-33b). Inspect for wear, chipping, and cracks.

•

Manual: With the pistol assembled, check the levers for ease of movement and positive retention. Move the recoiling parts around to make sure they work properly, do not bind, and the springs are not weak. Get a feel for the parts and the manner in which they function together.

Pay particular attention to mating surfaces (ribs and grooves, etc.) and the proper functioning of latching, catching, and locking devices. Click here for figure 2-34a (receiver ribs and grooves). Click here for figure 2-34b (slide ribs and grooves). Click here for figure 2-34c (catching and locking devices).

MCI Job Aid Inspection and Repair of the M9 Pistol

2-24

Chapter 2

Conducting an M9 Pistol Inspection

Safety and Function Checks

Perform these checks before disassembling the pistol. Do the checks almost as if you were actually firing the weapon; they may give you some clues to problem areas. Area Checked

Magazine

Step 1

2

1 Safety check 2 1 2 Hammer and trigger

3

4

Action Let the slide go home and insert a magazine. The magazine should enter the well smoothly and be retained by the magazine catch. Pull the slide to the rear. The magazine follower should push up on the slide stop, locking the slide in the open position. Remove the magazine, place the safety in the ON position, and release the slide. As the slide returns to battery, the hammer should fall. Pull the trigger. The hammer should not move. Place the safety in the OFF position. Squeeze the trigger. The hammer should cock and fall, and the firing pin block should move up and down. Squeeze the trigger once more, and, while holding the trigger to the rear, pull and release the slide. The hammer should assume the single action position. Pull the trigger again; the hammer should fall. Continued on next page

MCI Job Aid Inspection and Repair of the M9 Pistol

2-25

Chapter 2

Conducting an M9 Pistol Inspection, Continued

Trigger Pull Check

Perform a trigger pull test to make sure the amount of pressure (weight) required to pull the trigger is within standards. A fixture is used to hold weights applied to the trigger. Click here for figure 2-35. Use the following table to help measure the trigger pull pressure. Step 1 2 3 4

Single Action Trigger Pull Check

Action Place the trigger pull fixture on your workbench. Place a magazine in the pistol. Place the weapon safety in the OFF position and perform the trigger pull checks. Check both single and double-action trigger pulls.

Manually cock the pistol and place the trigger under the hook at the top of the fixture. Place the proper weights for the action to be checked on the fixture. Use the following table for amount of weight on the fixture and the corresponding action. Amount of Weight Placed on Fixture 4.0 lbs. minimum 6.5 lbs. maximum

Double Action Trigger Pull Check

Action Gently try to raise the pistol straight up. The hammer should not fall. Gently try to raise the pistol straight up. The hammer should fall.

Pull the trigger and let the hammer rest against the rear of the slide. Place the proper weights for the action to be checked. Use the following table for amount of weight on the fixture and the corresponding action. Amount of Weight Placed on Fixture 9.5 lbs. minimum 16.5 lbs. maximum

Action Add weights and try to lift the weights with the pistol. While the hammer may move slightly rearward, it should not cock and fall on its own. Place weights on the fixture. The hammer should cock and fall. Continued on next page

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Conducing an M9 Pistol Inspection, Continued

Assemblies and Parts

The best way to inspect assemblies and parts is to develop your own system. Inspect the groups and parts in the same order each time. When you have an established routine, it is harder to overlook something. Area Magazine

Step 1 2 3

Barrel 4 5

6 7 8 Slide

9 10

11

Action Examine the body for dents, cracks, or distortion. The lips should be uniform. With your index finger, work the follower up and down to check for spring tension. Check the bore for pits and bulges: • Pits cannot exceed the width of a land and must be no longer than 3/8-inch. • Any bulges are unacceptable. Flaking of the metal or cracks within the chamber area render the barrel unserviceable. Work the locking block up and down to check for smoothness of operation. Check the locking block lugs for cracks. The recoil spring must have a free length of no less than 5 inches. Inspect the ejection port area for cracks. Click here for figure 2-36. With the safety in the OFF position, push up on the firing pin block with your finger. Then, push forward on the firing pin striker and cause the firing pin to protrude from the face of the slide. Check the firing pin for a flattened or bent tip. Look at the extractor hook. It should not be bent or worn. The extractor should be under good spring tension. Push the safety to both the ON and OFF positions and check that it positively retained in both positions. Continued on next page

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Conduction an M9 Pistol Inspection, Continued

Assemblies and Parts, Continued

Area

Step 12 13

Receiver

14 15 16 17

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Authorized modifications. Use your magnifying glass to examine the rails and fore part of the receiver for cracks. Work all parts under spring tension back and forth to check for weak springs. Make sure the sear nose and hammer notches are sharp and distinct. Check the trigger bar for position. Look for the trigger bar spring since it is easily lost during cleaning. Check the grips for cracks. Grips should be snug to the frame. Check the mainspring. When removed from the pistol, it must have a free length of at least 2 inches.

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Repairing the M9 Pistol Operator Responsibilities Operator Responsibilities

Although operators have no repair functions in the strictest sense, they do • Perform preventive maintenance • Remedy improper assembly • Remove defective ammunition • Replace defective magazines

Preventive Maintenance (PM)

Since PM is any action that prevents the deterioration of and damage to equipment, it may also at times be considered corrective maintenance (CM). Performing PM actions on a malfunction caused by dirt, thereby correcting that malfunction, is a form of repair. Operators are responsible for performing normal preventive maintenance on the pistol and magazine. This PM is divided into four areas described in the following table. Area

Cleaning

Lubricating

Preserving

Protecting

Maintenance Carbon buildup and dirt accumulation will cause binding and wear of operating surfaces that interfere with the pistol’s proper function. Additionally, chemicals soaked up by carbon attack and corrode metal if not removed properly. Cleaning consists of removing all carbon, dirt, or any other foreign matter from the weapon. Clean the pistol before performing the next three PM actions. Oil or grease applied to bearing surfaces prevents binding and wear. A bearing surface is one that rubs or acts against another surface during firing. Lubrication of the mating surfaces of the rails in the slide and on the receiver is particularly important. Preservation prohibits corrosion. Applying a coat of oil to all metal surfaces is the operator’s preservative action. Do not apply preservative with bare fingers because body acids will penetrate the preservative. This action is simply using common sense. Keeping the pistol out of the weather as much as possible and not abusing it (throwing, kicking, dropping, etc.) are all protective actions. Continued on next page

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Operator Responsibilities, Continued

Disassembly

Armorers should tell operators to which level they may disassemble the pistol. Operators should disassemble the pistol only to that authorized level. Care taken during assembly will prevent mistakes.

Ammunition

Operators can correct malfunctions caused by ammunition. A dented or bulged cartridge can jam the weapon during functioning; a cartridge with a bad primer or insufficient powder won’t fire. Operators need to perform only immediate action known as TAP, RACK, and BANG. First TAP the magazine. Second, RACK the slide to the rear. Third, bring the pistol back on target and fire (BANG).

Magazine

Operators are authorized to replace only the magazine. They will normally be issued three magazines. If one becomes unserviceable, operators should return it to the place from which it was drawn (usually supply or the armory) for replacement.

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Unit Responsibilities

Unit Responsibilities

The unit armorer will take corrective action whenever one of the unit’s pistols is found to be defective. Corrective maintenance at the unit level may take one of three forms: cleaning, repair, or evacuation of the weapon for higher echelon repair.

Cleaning

Cleaning is the unit armorer’s responsibility in two instances: • When it involves disassembly and assembly that the operator cannot perform • If special cleaning agents or abrasives are to be used

Repair

The NCOIC of the unit armory is responsible for making sure armorers have the tools, parts, and more importantly, the knowledge to perform all authorized repair actions. The following table describes the three subcategories of repair. Repair Reconditioning Replacement Adjustment

Evacuation

Description The returning of unserviceable parts to serviceable condition by stoning, filing, tapping threads, etc. Substituting new or serviceable used parts for unserviceable parts. Correcting improper assembly or incorrect positioning of parts.

Before evacuating a weapon to the intermediate support repair unit, the unit armorer must make sure all using unit maintenance responsibilities (cleaning and authorized repairs) have been completed first. The only exception is when the unit repairs are pending the arrival of parts; in that case, documents showing the parts ordered should accompany the weapon to intermediate support.

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Intermediate Maintenance Activity (IMA) Responsibilities

IMA Responsibilities

The IMA is authorized to perform third and fourth echelon repairs. The three end results for weapons evacuated to an IMA are that the pistol will be • Repaired (and returned to the using unit) • Declared non-repairable (Code H) • Evacuated to a depot maintenance activity (DMA) for fifth echelon work

Repair

IMA repairers have special disassembly/assembly tools, jigs, fixtures, and other devices including power tools that enable them to perform extensive repairs on the pistol. An important tool set for an intermediate shop is the tap and die set. Taps and dies are used to restore worn threads on parts, assemblies, and groups. They are made of extremely hard metal. By being threaded into interior threads (taps) or into exterior threads (dies); they displace deformed metal and sharpen thread edges. Taps are especially useful in restoring threads for grip screw bushings.

Code H

Some unserviceable weapons the repairer will declare non-repairable. In those cases, the IMA will request disposition instructions for each piece of equipment. These instructions may be to demilitarize (destroy) the weapon at IMA level or to ship the weapon, either complete or with serviceable parts removed, to a depot facility (DMA). When a weapon is “coded out,” the disposition instructions are authorization for the using unit to order a replacement weapon.

Evacuation

Except on rare occasions, all weapons evacuated from the IMA will be shipped to the DMAs at Albany, Georgia or Barstow, California. Very few defects of the pistol require fifth echelon repair. Depots mainly rebuild and refinish old weapons.

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