The Colt M16A1 rifle entered military service in 1969 and had many improvements over the standard M16 rifle. Chambered in 5.56×45 mm NATO and gas operated, the rifle was capable of firing 700-800 rounds per minute in full auto. These rifles are built using original Colt rifle parts kits with a new US non Colt receiver & barrel by Southern Tactical . AR15 , M16A2 , M16A4, AR-15
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