5.56-MM SUBMACHINE GUN, XM177E2
Technical information rept.
PITTSBURGH UNIV WASHINGTON DC RESEARCH STAFF
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A modified version of the M16A1 5.56-mm rifle, the XM177E2 5.56-mm submachine gun has a shorter barrel, a different type of flash suppressor, and a telescoping butt stock. Gas-operated, air-cooled, and fed from a 20-round aluminum box magazine, the XM177E2 is capable of semiautomatic or full-automatic fire, selectable by a manual lever. Loaded with a full magazine, the weapon weighs 6.8 pounds, has a cyclic rate of fire of from 650 to 900 rounds per minute, and has a muzzle velocity of 2,770 feet per second.