M16 RIFLE

also called Ar-15, assault rifle adopted as a standard weapon by the U.S. Army in 1967. The M16 superseded the M14 rifle. It is gas-operated and has both semiautomatic (i.e., autoloading) and fully automatic capabilities. Weighing less than 3.6 kg (8 pounds) and equipped with a 20-round or 30-round magazine, the M16 is 99 cm (39 inches) long and fires 5.56-millimetre (.223-calibre) ammunition at the rate of 700950 rounds per minute. Both U.S. and South Vietnamese forces used it during the Vietnam War.