AR-15

The AR-15 is an automatic rifle designed by Eugene Stoner[?] of the Armalite[?] corporation. It has been manufactured by various companies in both automatic and semiautomatic versions, in many configurations. Within the US military, the rifle is known by the military designation M16. Developed by Eugene Stoner after the AR-10[?] rifle, it preserved most of its predecessors admirable features, and was adopted in limited numbers by the Air Force.

See M16 for more details.