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 5-2.5 M2 (T2) Flash Reducer The M2 flash reducer (1) pads serve to limit breech flashback, as well as muzzle brake flash and blast overpressure. The M2 flash reducer consists of a red cotton cloth bag, 4 inches (1 0.16 cm) square, containing black powder and potassium sulfate or potassium nitrate. The M2 flash reducer, which is a separate item of issue, may be used with M4A1 propelling charge if additional flash reduction is desired. In preparing an M4A1 white bag propelling charge for firing, one flash reducer is added in front of the base charge and one in front of each increment used. 5-42