Tags: Weapon.
The AR-15 is a lightweight 5.56 mm/.223-caliber magazine-fed air cooled rifle with a rotating-lock bolt actuated by direct impingement gas operation or long/short stroke piston operation. It has been produced in many different versions including numerous semi-automatic and selective fire variants. It is manufactured with extensive use of aluminum alloys and synthetic materials.The AR-15 was first built by ArmaLite as a small arms rifle for the United States armed forces.
