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The AR-15 rifle usually comes chambered for either the military cartridge 5.56×45mm or the .223 Remington. Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as .223 Remington, since this can result in damage to the rifle or injury to the shooter. [ 1 ]
Rifles styled like the AR-15 come in many sizes and have many options, depending on the manufacturer. The lower receiver, without the receiver extension, rear takedown pin, and buttstock, is shown at bottom. An AR-15–style rifle is a lightweight semi-automatic rifle based on or similar to the Colt AR-15 design.
Any cartridge candidates for the AR-15 family of rifles must be limited to a cartridge over all length (COAL) of 2.260 inches, in order to fit in the magazines. The .25-45 Sharps cartridge is an AR-15 wildcat that is growing in popularity. It uses .257 caliber bullets (6.5 mm), and popular bullet weights are between 75 and 117 gr.
The .458 SOCOM (11.63×40mmRB) is a moderately large round designed to work in an AR-15 platform.This is achieved by installing a 458 bolt and barrel. The 300-grain (19 g) round offers a supersonic muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft⋅lbf (3,261 J), [1] similar to a light .45-70 but with a much smaller case.
Slim, long bullets with high ballistic coefficient are ideal for energy retention at long ranges. [2] It is similar to the 6PDK which also uses a 6.2 mm bullet and a similar muzzle energy and case capacity to the 6mm AR and 6.5 Grendel, in a casing somewhat popular [3] for the AR-15, a necked-down 6.8mm Remington SPC casing. [citation needed]
From left to right: 1.17 Hornady Mach 2, 2.17 Hornady Magnum Rimfire, 3.22 Long Rifle, 4.22 Winchester Magnum Rimfire, 5.17/23 SMc, 6 5mm/35 SMc, 7.22 Hornet, 8.223 Remington, 9.223 WSSM, 10.243 Winchester, 11.243 Winchester Improved (Ackley), 12.25-06 Remington, 13.270 Winchester, 14.308 Winchester, 15.30-06 Springfield, 16.45-70 Government ...
The ArmaLite AR-15 was designed to be a lightweight rifle and to fire a new high-velocity, lightweight, small-caliber cartridge to allow infantrymen to carry more ammunition. [ 11 ] In 1959, ArmaLite sold its rights to the AR-15 to Colt due to financial difficulties and limitations in terms of manpower and production capacity. [ 1 ]
8mm Lebel replacement. Rimless rifle cartridge. Same bullet diameter as .30-06. Short-lived due to confusion with 7.92mm Mauser. 7.5×54mm French: 1929 France R 7.57x54mm 2700 2232 58 0.308 54mm Case-shortened 7.5×57mm MAS. Standard French rifle cartridge until the introduction of the FAMAS in 1979. 7.62×25mm Tokarev: 1930 [3] USSR [8] 2 [13 ...