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 5-2 AUTHORIZED MUNITIONS — CONTINUED 5-2.4 M82 Primer The M82 primer is the only primer authorized for firing in the M109A2/M109A3/M109A4 M185 and M109A5 M284 cannon assemblies. Do not fire the MK2A4 primer in these cannon assemblies as it may cause misfires or equipment damage. The M82 primer (1), which is loaded separately from the projectile, is inserted into the primer chamber. When the cannon is fired, the firing pin strikes the primer which in turn ignites the propelling charge that moves the projectile forward. 5-41