MIL-S-63348A (AMENDMENT 4)
MIL-S-63348A (AMENDMENT 4), MILITARY SPECIFICATION: SUBMACHINE GUN, 5.56MM, PORT FIRING, M231 (29 OCT 1992) ., This Amendment forms a part of Military Specification MIL-S-63348A(AR), dated 20 August 1981, and is approved for
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