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Designer Eugene Stoner did not consider the AR-15 to be a conventional direct impingement mechanism, but that is how it came to be characterized. This mechanism is often called " direct gas impingement" (DGI), although it differs from prior gas systems. The bolt carrier acts as a movable cylinder and the bolt itself acts as a stationary piston. Patent 2,951,424 describes the cycling mechanism used in the original AR-15. Over the decades, Colt has made many different types of AR-15 rifle and carbine models, including the AR-15, AR-15A2, AR-15A3, AR-15A4, and many other models.Īlthough the sale of new AR-15s was banned by the Federal Assault Weapons Ban from 1994 to 2004, Colt and others continued to sell legally compliant versions during that period. 223 Remington, with a 20-inch barrel and issued with 5-round magazines. The first mass production version was the Colt AR-15 Sporter, in. Colt started selling the semi-automatic version of the M16 rifle as the Colt AR-15 in 1964. This example is fitted with an early waffle-patterned 20-round magazine.ĭue to financial problems, and limitations in terms of manpower and production capacity, ArmaLite sold the ArmaLite Rifle-15, abbreviated AR-15 design and the AR-15 trademark along with the ArmaLite AR-10 to Colt's Manufacturing Company in 1959. Colt's Manufacturing Company currently uses the AR-15 trademark for its line of semi-automatic AR-15 rifles.įor more a more detailed list of AR-15 models, see List of Colt AR-15 & M16 rifle variants#Colt civilian models.ġ973 Colt AR-15 SP1 rifle with "slab side" lower receiver (lacking raised boss around magazine release button) and original Colt 20-round box magazineĪ Colt AR-15 on display at the National Firearms Museum. It is a semi-automatic version of the United States military M16 rifle that is marketed to civilian and law-enforcement customers. It was designed to be manufactured with extensive use of aluminum alloys and synthetic materials. The Colt AR-15 is a lightweight, 5.56×45mm, magazine-fed, gas-operated semi-automatic rifle. Picatinny rails, which allows the use of various scopes and sighting devices.Detachable carrying handle with adjustable rear iron sight assembly.*Fixed adjustable front and rear iron sights Issued with 5-, 10-, 20- & 30-round STANAG magazines See List of Colt AR-15 & M16 rifle variants For other uses, see AR-15 (disambiguation). For the select-fire rifle of a similar name, see ArmaLite AR-15. For other weapons colloquially referred to as "AR-15", see AR-15 style rifle. This article is about the weapon produced by Colt.