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The ArmaLite AR-10 is a 7.62×51mm ... from the sale of approximately 2,500 AR-10 rifles ... lower receivers while using imported upper AR-10 receivers ...
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.
ArmaLite AR-15 with the charging handle located on top of the upper receiver, protected within the carrying handle and a 25-round magazine. 1973 Colt AR-15 SP1 rifle with "slab side" lower receiver (lacking raised boss around magazine release button) and original Colt 20-round magazine.
ArmaLite AR-10. In 1955, Stoner completed initial design work on the revolutionary ArmaLite AR-10, a lightweight (3.29 kg (7.25 lb)) select-fire infantry rifle in 7.62×51mm NATO caliber. Besides featuring the Stoner bolt and carrier piston system, the AR-10 stock was in line with the bore to reduce muzzle rise, especially during automatic fire.
An Armalite rifle (AR) is one of a series of rifles the ArmaLite company made or, more generally, a rifle based on one of its designs, such as the ArmaLite AR-15 rifle. Eugene Stoner , Jacques Michault, Melvin Johnson , Robert Fremont, and Jim Sullivan are some of the designers credited with their development. [ 1 ]
List of AR platform cartridges; Close Quarters Battle Receiver; CMMG Mk47 Mutant; CMMG MkG; Colt 9mm SMG; Colt ACR; Advanced Colt Carbine-Monolithic; Colt Advanced Piston Carbine; Colt AR-15; Colt Automatic Rifle; Colt Canada C7 and C8; Colt Canada C20 DMR; Colt CM901; Colt MARS
[17] [18] A lighter weight selective fire variant of the AR-10 was designed in 1958 for military use and designated the ArmaLite model 15, or AR-15. [19] [16] Due to financial problems and limitations in terms of manpower and production capacity, ArmaLite sold the AR-15 and AR-10 designs and trademarks to Colt in 1959. [20]
The ArmaLite AR-15 internal piston action was derived from the original ArmaLite AR-10 action and was later used in the M16 rifle action. This internal piston action system designed by Eugene Stoner is commonly called a direct impingement system, but it does not utilize a conventional direct impingement system.