The M16 first saw combat in the Vietnam war and went on to become ... That fact alone speaks volumes to the validity and effectiveness of the cartridge. As a standard, 5.56mm NATO and .223 Rem. rifles ...
The M4/M4A1 5.56mm Carbine is a lightweight ... 45 caliber submachine guns, and selected M9 pistols and M16 rifles. The Army is pursuing a two-phase PIP to keep the M4 carbine inventory strong.
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