 ArmaLite AR-18

The ArmaLite AR-18 is a gas-operated rifle chambered for 5.56×45mm NATO ammunition.The AR-18 was designed at ArmaLite in California by Arthur Miller, Eugene Stoner, George Sullivan, and Charles Dorchester in 1963 as an alternative to the ArmaLite AR-15 design, which had just been selected by the U.S. military as the M16.