what part of an ar 15 has the serial number
lower assembly
title: Colt AR-15 text: Colt AR-15 The Colt AR-15 is a lightweight, 5.56×45mm, magazine-fed, gas-operated semi-automatic rifle. It was designed to be manufactured with extensive use of aluminum alloys and synthetic materials. It is a semi-automatic version of the United States military M16 rifle that is marketed to civilian and law-enforcement customers. Colt's Manufacturing Company currently uses the AR-15 trademark for its line of semi-automatic AR-15 rifles. Due 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 title: Arkansas Highway 15 text: Arkansas Highway 15 Arkansas Highway 15 (AR 15) is the designation for two state highways in Arkansas. The northern segment of runs from Altheimer north across Interstate 40 to Furlow. The southern segment of is entirely in Union County, and runs from Louisiana Highway 161 north to U.S. Route 82 in El Dorado. AR 15 begins at Louisiana Highway 161 and runs northeast, cutting through South Arkansas country. The highway serves as a southern terminus for Arkansas Highway 355 outside El Dorado, AR 15 lone junction with another state road. AR 15 next meets the four-lane U.S. Route 82 outside title: Colt AR-15 text: started selling the semi-automatic version of the M16 rifle as the Colt AR-15 in 1964. The first mass production version was the Colt AR-15 Sporter, in .223 Remington, with a 20-inch barrel and issued with 5-round magazines. 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. Although 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. describes the cycling mechanism used in the original title: CAR-15 text: CAR-15 The Colt Automatic Rifle-15 or CAR-15 was a family of M16 rifle based firearms marketed by Colt in the 1960s and early 1970s. However, the term "CAR-15" is most commonly associated with the Colt Commando (AKA: XM177); these select-fire carbines have ultrashort and barrels with over-sized flash suppressors. The CAR-15 name was an attempt to re-associate the AR-15 name with Colt, since the AR initially stood for ArmaLite Rifle, the original manufacturer of the ArmaLite AR-15. Colt later abandoned the CAR-15 concept, but continued to make carbine variations, using the "M16" brand for select-fire models and the "Colt AR-15" title: AR-15 style rifle text: and Recreational Firearms Use Protection Act restricted the Colt AR-15 and derivatives from 1994-2004, although it did not affect rifles with fewer features. In 1956, ArmaLite designed a lightweight assault rifle for military use and designated it the ArmaLite Rifle-15, or AR-15.<ref name="Bartocci_7/16/2012"></ref> Due to financial problems and limitations in terms of manpower and production capacity, ArmaLite sold the design and the AR-15 trademark along with the ArmaLite AR-10 to Colt's Manufacturing Company in 1959. In 1964, Colt began selling its own version with an improved semi-automatic design known as the Colt AR-15. After Colt's patents expired in 1977, an