Warning

Failure to replace the breech assembly and the firing pin at the specified intervals may result in explosion or unexpected firing of the gun. Serious injury or death to personnel and damage to equipment may result.

When handling material contaminated by Depleted Uranium (DU), avoid skin contact with the corrosion by wearing NBC gloves. Always flush hands before eating or touching your face. Dispose of gloves in accordance with AR 11-9.

If M919 usage is suspected, prior to performing any M242 weapon maintenance procedures, survey the muzzle end of the gun barrel with an AN/VDR-2, PDR-27 or equivalent radiation detection instrument, in accordance with prescribed operating procedures (see TM 11-6665-251-10 or TM 11-6662-361-10). If the barrel is found to be radioactively contaminated, the barrel is to be taken out of service without being cleaned, ends sealed with tape, and the barrel marked "Low Level Radioactive Waste". Storage and return of the barrel is accomplished in accordance with AR 11-9.

If a Bradley vehicle is hit or burned in combat, refer to TB 9-1300-278, Guidelines for Safe Response to Handling, Storage, and Transportation Accidents Involving Army Tank Munitions or Armor which contain Depleted Uranium.

Due to the critical nature of the breech assembly and firing pin for the safe and reliable operation of the gun, these components, without exception, will be inspected or replaced at the following intervals.

Standard Breech Assembly (12524370)

Inspect at 12,500 rounds, and every 2,500 rounds thereafter.

Enhanced Breech Assembly (12524527)

Replace at 25,000 rounds (WP 0051 00)

Inspect at 25,000 rounds, and every 5,000 rounds thereafter.

Firing Pin (12524325) Firing Pin (12524512)

Replace at 8,000 rounds (WP 0055 00) Replace at 12,000 rounds (WP 0055 00)

Physical identification of the firing pin and breech designs are shown on the following page.

1005 086 1400

FIRING PIN ASSEMBLY PN 12524512

Bevfitchett M242 25mm
1df0181

■NO SHOULDER

STANDARD M242 BREECH ASSEMBLY PN 12524370

1005 086 1400

ENHANCED M242 BREECH ASSEMBLY PN 12524527

END OF WORK PACKAGE

UNIT

M242 25-MM AUTOMATIC GUN (NSN 1005-01-086-1400) M242 25-MM ENHANCED AUTOMATIC GUN (NSN 1005-01-454-0396)

UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES, INCLUDING LUBRICATION INSTRUCTIONS

PMCS PROCEDURES

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