The standard issue military assault rifle, fires 5.56 X 45mm round (.223) about 39 inches overall length, big brother to the M4A1. There are 4 different variations of the M16. M16A1(AKA VN), M16A2, M16A3, and M16A4(with removable carrying handle for optics)
In the Vietnam War, the congs were shot by mostly M16s
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