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An AR-15–style rifle is a lightweight ... barrel for improved accuracy ... AR-15–style rifles are now available in a wide range of configurations and calibers ...
The Colt AR-15 is a product line of magazine-fed, gas-operated, autoloading rifle manufactured by Colt's Manufacturing Company ("Colt") in many configurations. [1] The rifle is a derivative of its predecessor, the lightweight ArmaLite AR-15, an automatic rifle designed by Eugene Stoner and other engineers at ArmaLite in 1956.
At this point, the bureaucratic battle lines were well-defined, with the Army ordnance agencies opposed to the AR-15 and the Air Force and civilian leadership of the Defense Department in favor. [27] In January 1963, Secretary of Defense Robert McNamara concluded that the AR-15 was the superior weapon system and ordered a halt to M14 production ...
The Canadian company Colt Canada (formerly Diemaco) licensed production of a rifle (Colt Model 715) and carbine (Colt Model 725), but later went on to produce an entire line of AR-15/M16 pattern weapons developed independently. In May 2005, Colt's Manufacturing Company acquired Diemaco, and the name was changed to Colt Canada.
[36] [39] [84] [85] However, despite overwhelming evidence that the AR-15 could bring more firepower to bear than the M14, the Army opposed the adoption of the new rifle. [36] [39] [78] In January 1963, Secretary of Defense Robert McNamara concluded that the AR-15 was the superior weapon system and ordered a halt to M14 production.
15.24 mm (0.600 in) Base diameter: ... AR-15.408 Chey Tac upper [30] THOR XM408; ... Such rifles are ordered by long-range accuracy oriented shooters and built by ...
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Any AR-15/AR-10 cartridge cases that are derived from the 7.62x51 can also be formed from these listed calibers. (7.62x51 & .308 are similar in external dimensions though the Brass has different internal capacity and Max PSI recommendations are different & Chambers are different.) AR-10: The AR-10 is slightly larger and heavier than the AR-15.