ArmaLite AR-100

The ArmaLite AR-100 was an assault rifle based on the previous AR-16. The weapon was intended to increase firepower of a squad as well as mobility.

Overview
The ArmaLite AR100 is a 5.56×45mm NATO caliber short-stroke piston gas-operated, 5.56×45mm NATO assault rifle fed from 30- round and 100-round drum magazines that eject from the magazine insert when empty and are discarded during a firefight. The AR-101 and AR-102 fire from closed bolt in semi-auto and open bolt in full auto whereas the AR-103 and AR-104 open bolt fire only.