The Colt AR-15 is a lightweight, 5.56×45mm, magazine-fed, gas-operated semi-automatic rifle. The "AR” stands for ArmaLite Rifle. It was designed to be manufactured with extensive use of aluminum alloys and synthetic materials. Colt was but no longer is marketing to civilian customers and is presently only marketing to law-enforcement customers, due to oversaturation in the civilian market. Colt's Manufacturing Company currently uses the AR-15 trademark for its line of semi-automatic AR-15 rifles.

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