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 2-12 PREPARATION FOR FIRING — CONTINUED 2-12.4 Pre-Fire Checks — Continued c. Breech 1 Witness marks (9) on breech ring (8) and breechblock (10) must aline when breechblock is closed. 2 Firing mechanism (11) and block assembly (12) must be working properly. 3 Primer chamber (13) must be clean and operating handle (14) securely latched forwvard. d. Rammer Assembly Perform rammer reliability checks (para 3-6.3). 2-201