Note

Do not remove the feed tray pawl unless parts replacement is necessary.

1. REMOVE FEED SLIDE ASSEMBLY FROM FEED TRAY.

a. Move feed slide assembly (1) to the left in the feed tray (2) until the tabs (3) are lined up with the slots in the feed tray. Lift the assembly out of the feed tray.

Mark Feed Tray

Tools and Special Tools - Continued

Tool set, intermediate maintenance, SL-3-08669A (Marine Corps only) Tool set, organizational maintenance, SL-3-08668A (Marine Corps only)

INSPECTION OF INSTALLED ITEMS

1. GENERAL. WHILE ASSEMBLED, INSPECT FOR OBVIOUS DEFECTS.

a. Examine flat surfaces (1) for cracks.

b. Inspect for burrs along the rails of the tray (2). Remove burrs using a stone.

c. Press the feed tray pawl (3) to test pawl spring action. If binding, lubricate. If weak, install a new pawl spring. If there is relative movement between the headless grooved pin and feed pawl, install

2. HEADLESS GROOVED PIN INSPECTION.

a. Inspect the ridges of the pin for wear. Replace if bent, broken, or worn.

3. TAP OUT THE HEADLESS GROOVED PIN.

a. Using the punch and hammer, tap out the headless grooved pin (4) from inside to outside of the feed tray. Separate the feed tray pawl (5) and pawl spring (6).

a new headless grooved pin.

1LK105

ASSEMBLY

1. INSTALL FEED TRAY.

a. Insert the pawl spring (1) into the hole in the feed tray. Position the feed tray pawl (2)

against the feed tray, pin holes aligned. Insert the headless grooved pin (3) from outside to inside and tap it in with the hammer until the headless grooved pin is flush with the outside of the feed tray.

b. Install the feed tray, recessed side up, aligning the pin holes in the feed tray with those in the receiver.

c. Install feed slide assembly to the feed tray, aligning feed tray pawls with the slots in feed tray. Slide feed slide assembly completely to the right.

END OF WORK PACKAGE

UNIT

MK 19 MOD 3 40 MM MACHINE GUN (NSN 1010-01-126-9063) UPGUNNED WEAPONS STATION MK 19 40 MM MACHINE GUN (NSN 1010-01-362-6513)

MAINTENANCE OF MK 19 MACHINE GUN ASSEMBLY - ROUND POSITIONING BLOCK -

REMOVAL/INSTALLATION REMOVAL, INSPECTION OF INSTALLED ITEMS, INSTALLATION

INITIAL SETUP:

Tools and Special Tools

Tool kit, small arms repairman

SC 4933-95-CL-A07 with addition of SL-3-00607A (Marine Corps only) Tool kit, small arms repairman,

SC-5180-95-CL-A07 Tool set, intermediate maintenance, SL-3-08669A (Marine Corps only)

Tools and Special Tools - Continued

Tool set, organizational maintenance, SL-3-08668A (Marine Corps only)

Equipment Condition

Alignment guide assembly removed from receiver (WP 0041 00).

REMOVAL

1. REMOVE ROUND POSITIONING BLOCK.

a. Depress and push-slide round positioning block forward until it stops. Pull round positioning block away from receiver.

INSPECTION OF INSTALLED ITEMS

1. INSPECT ROUND POSITIONING BLOCK.

a. Inspect round positioning block (1). If pins (2) or springs are bent or loose, replace the round positioning block.

Mk19 Drawings

INSTALLATION

1. INSTALL ROUND POSITIONING BLOCK.

a. Insert the pins on the round positioning block into the keyslots in the receiver wall. Push-slide round positioning block rearward until it clicks in place.

END OF WORK PACKAGE

UNIT

MK 19 MOD 3 40 MM MACHINE GUN (NSN 1010-01-126-9063) UPGUNNED WEAPONS STATION MK 19 40 MM MACHINE GUN (NSN 1010-01-362-6513)

MAINTENANCE OF BARREL AND FLASH SUPPRESSOR -INSPECTION OF INSTALLED ITEMS, ASSEMBLY

INITIAL SETUP:

Tools and Special Tools

Tool kit, small arms repairman,

SC-5180-95-CL-A07 Tool kit, small arms repairman

SC 4933-95-CL-A07 with addition of SL-3-00607A (Marine Corps only) Tool set, intermediate maintenance, SL-3-08669A (Marine Corps only) Tool set, organizational maintenance, SL-3-08668A (Marine Corps only)

Materials/Parts

Lubricant (as required)

Slotted spring pin (item 20, WP 0125 00)

Wiping rag (item 12, WP 0124 00)

INSPECTION OF INSTALLED ITEMS

1. INSPECT BARREL EXTERIOR.

a. Inspect barrel exterior for rust, dents, and cracks. Remove rust with lubricant and wiping rag. If dents or cracks are found, evacuate to Direct Support Maintenance.

1. INSPECT FLASH SUPPRESSOR.

a. Inspect for rust, dents, and cracks. Remove rust with lubricant and wiping rag. Ensure flash suppressor (1) is slightly loose. If flash suppressor is tight or dents interfere with functioning, drive out the slotted spring pin (2) using 3/32 inch punch and hammer. Discard the slotted spring pin. Unscrew the flash suppressor from the barrel.

INSPECTION OF INSTALLED ITEMS - Continued

3. BARREL INSPECTION CRITERIA.

a. Bore and chamber must be clean and free of corrosion.

b. Pits in the chamber are allowable if they are not large enough to cause extraction difficulties.

c. Pits less than the width of a land or groove in width or length are allowable. Replace if pits are greater than width of a land or groove, and if pits are 50 percent cumulative or 25 percent continuously.

d. Scattered or uniformly fine pits are allowable.

e. Tool marks or scratches are acceptable regardless of length. Tool marks will appear as lines running laterally in the grooves or they may run spirally across the top of the lands.

f. Definitely ringed bores or bores ringed sufficiently to bulge the outside surface barrel are cause for rejection. However, faint rings or shadowy depressions do not indicate an unserviceable barrel and should not be cause for rejection.

g. Lands that appear dark due to a coating of gilding metal from projectiles should not be cause for rejection.

ASSEMBLY

1. INSTALL FLASH SUPPRESSOR.

a. Screw the threaded end of the flash suppressor (1) all the way into the smaller end of the barrel (2) until none of the threads are showing. Then slightly reverse rotation (flash suppressor) until you can see through both pin holes in the flash suppressor. This indicates the holes are aligned with the flat (3) threaded surface of the barrel.

1 1LK109

2. INSTALL SLOTTED SPRING PIN.

a. Insert a 3/32 inch punch through the pin holes of flash suppressor (1) and barrel (2) to assure proper hole alignment. Tap in the slotted spring pin (4) from side opposite the punch, ensuring that the flash suppressor is slightly loose. This will not affect it's functioning. Ensure the slotted spring pin is equally extended on both sides.

END OF WORK PACKAGE

UNIT

MK 19 MOD 3 40 MM MACHINE GUN (NSN 1010-01-126-9063) UPGUNNED WEAPONS STATION MK 19 40 MM MACHINE GUN (NSN 1010-01-362-6513)

MAINTENANCE OF MK 19 MACHINE GUN - BOLT AND BACKPLATE ASSEMBLY

DISASSEMBLY/ASSEMBLY DISASSEMBLY AND ASSEMBLY

INITIAL SETUP:

Tools and Special Tools

Materials/Parts

Cotter pin (1) (item 2, WP 0125 00) Hexagon head self-locking cap screw (3)

Tool kit, small arms repairman,

SC-5180-95-CL-A07

Tool kit, small arms repairman,

(item 12, WP 0125 00) Wiping rag (item 12, WP 0124 00)

SC 4933-95-CL-A07 with addition of

SL-3-00607A (Marine Corps Only)

Tool set, organizational maintenance, SL-3-08668A (Marine Corps only)

Tool set, intermediate maintenance, SL-3-08669A (Marine Corps only)

Equipment Condition

Bolt and backplate assembly removed from weapon (WP 0041 00).

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