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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.
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.
An AR-15–style rifle is a lightweight semi-automatic rifle based on or similar to the Colt AR-15 design. The Colt model removed the selective fire feature of its predecessor, the original ArmaLite AR-15, which is a scaled-down derivative of the AR-10 design (by Eugene Stoner). It is closely related to the military M16 rifle.
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.
AR-15.223 Remington, 5.56 NATO: ArmaLite, Colt's Manufacturing Company: A lightweight assault rifle. A smaller version of the AR-10 and adopted by the United States military as the M16 rifle. Later developed by Colt into a popular semi-automatic Colt AR-15. AR-16: 7.62×51mm NATO: ArmaLite: Prototype battle rifle. ArmaLite AR-17: 12 gauge
The Armalite AR-15 is the parent of a variety of Colt AR-15 and M16 rifle variants. History After World War II, the United States military started looking for a single automatic rifle to replace the M1 Garand , M1/M2 Carbines , M1918 Browning Automatic Rifle , M3 "Grease Gun" and Thompson submachine gun .
7.62×51mm NATO (.308 Winchester) (Postwar use by U.S.Navy) United States 1934 Springfield Armory M1A: Springfield Armory: 7.62×51mm NATO (.308 Winchester), 6.5mm Creedmoor United States 1954 M21 Sniper Weapon System: Rock Island Arsenal Springfield Armory: 7.62×51mm NATO United States 1968 M25 Sniper Weapon System: Springfield Armory.308 ...
M16/M4/AR-15 and derivatives Assault rifle/semi-automatic rifle United States: 15,000,000 20,000,000 10 million military M16/M4, (Colt production only as of 2011) [14] 5-10 million civilian AR-15 (as of 2016) [15] [16] Lee–Enfield: Bolt-action rifle United Kingdom: 16,000,000 [17] 17,000,000 [18] SKS: Semi-automatic rifle Soviet Union ...