Mk19 Buffer Springs

Measure springs less than 6 inches long using a dial caliper. Measure springs over 6 inches long using a tape measure. If the length is less than that given below, replace with a new spring. Replace all parts of springs (such as extractor springs, finger springs, etc.). Measure and replace springs only when performing maintenance requiring disassembly/assembly of components.

SPRING PER GUN

Bolt and Backplate Assembly:

Cocking Lever Spring (Spring, Helical) 1

Sear Buffer Spring (Spring, Helical) 3269425 1

LH, RH Extractor Spring (Spring, Helical) 2

2813531

Finger Spring (Spring, Helical) 2813528 2

Firing Pin Sear Spring (Spring, Helical) 1

3269525

Firing Pin Spring (Spring, Helical) 3269417 1

Firing Pin Sear Inner Spring (Spring, Helical) 1

5526208

Round Stop Spring (Spring, Helical) 1

MS24585-2121

Recoil Spring (Spring, Helical, Recoil) 3269433 2

Ogive Plunger Assembly:

Ogive Plunger Spring (Spring, Helical) 1

32694553269455

Feed Slide Assembly:

Shuttle Spring 3269462 1

Sear Assembly:

Sear Spring (Spring, Helical) 3269517 1

END OF WORK PACKAGE

REPLACE IF LESS THAN (INCHES):

2.400 1.400 0.580

0.840 0.460

3.000 0.560

0.930

17.500

1.800

5.770 0.960

CHAPTER 5

DIRECT SUPPORT MAINTENANCE INSTRUCTIONS

MK 19 MOD 3 40 MM MACHINE GUN AND

UPGUNNED WEAPONS STATION MK 19 40 MM MACHINE GUN

DIRECT SUPPORT

MK19 MOD 3 40 MM MACHINE GUN (NSN 1010-01-126-9063) UPGUNNED WEAPONS STATION MK19 40 MM MACHINE GUN (NSN 1010-01-362-6513)

SERVICE UPON RECEIPT

SERVICE UPON RECEIPT

Refer to Service Upon Receipt (WP 0037 00) in Unit Maintenance. END OF WORK PACKAGE

DIRECT SUPPORT

MK19 MOD 3 40 MM MACHINE GUN (NSN 1010-01-126-9063) UPGUNNED WEAPONS STATION MK19 40 MM MACHINE GUN (NSN 1010-01-362-6513)

MAINTENANCE OF THE MK19 MOD 3 40 MM MACHINE GUN - DISASSEMBLY/ASSEMBLY

DISASSEMBLY, ASSEMBLY

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

Materials/Parts

Lubricant (as required)

Equipment Condition

Weapon on 'S' (SAFE), clear of ammo, bolt in forward position.

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