- AR 15 Rifle
The AR-15 comes in many sizes and has many options, depending on the manufacturer. The Colt AR-15 is a lightweight, 5.56 mm, magazine-fed, semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation or long/short stroke piston operation. It is manufactured with the extensive use of aluminum alloys and synthetic materials. The AR-15 was first built by ArmaLite as an assault rifle for the United States armed forces.
The AR-15 is a widely owned semi-automatic rifle. The AR does not stand for "Assualt Rifle" as many believe, it was named after the manufacturer that first built it, Armalite.