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TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download

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TM 9-2350-311-10 3-6 ARMAMENT AND CAB MAINTENANCE — CONTINUED 3-6.8 Breech Mechanism — Continued a. Disassembly — Continued • The follower group has a safety interlock, which keeps the block assembly from moving to the firing position until breechblock is fully closed. The follower must be in good working condition and properly assembled to make sure safety interlock works to avoid injury. • The firing pin is under pressure and will spring out when removed. Hold firing pin during disassembly to prevent injury. 23 Remove lock pin (68), firing pin (69), and spring (70) from block assembly (29). 3-67