The AR-15 was first built by ArmaLite as a selective fire assault rifle for the United States armed forces. It is manufactured with the extensive use of aluminum alloys and synthetic materials. The AR-15 is a lightweight, 5.56 mm, air-cooled, gas-operated, magazine-fed semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation or long/short stroke piston operation. The part shown bottom center is the lower receiver, which under US law is the component legally considered the "firearm".ĪrmaLite, Colt, Bushmaster, Rock River Arms, Stag Arms, DPMS Panther Arms, Olympic Arms, and others.Ĩ00 rounds/min (fully automatic versions only) The AR-15 comes in many sizes and has many options, depending on the manufacturer.
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