What rifle is the basis for the the magazine-fed, gas-operated semi-automatic rifle designed to be manufactured with the extensive use of aluminum alloys and synthetic materials?
AR-15 (disambiguation): AR-15 most commonly refers to the Colt AR-15, a line of semi-automatic rifles manufactured by Colt, based on the United States military M16 rifle. Colt AR-15: The Colt AR-15 is a lightweight, 5.56×45mm, magazine-fed, gas-operated semi-automatic rifle.
United States military M16 rifle