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Novosibirsk, Russia - May 15, 2018 - Homepage of the official website for the National Rifle Association, url - explore.nra.org Royalty Free Stock Photo

The AR-15 is a lightweight, 5.56 mm caliber, air-cooled, gas-operated, magazine-fed rifle, with a rotating bolt, actuated by direct impingement gas operation. It is constructed of steel, aluminum and composite plastics.