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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]
The .223 Remington (designated 223 Remington by SAAMI [4] and 223 Rem. by the C.I.P. [5]) is a rimless, bottlenecked, centerfire intermediate cartridge.It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm.
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 ]
Cruz used a Smith & Wesson AR-15, a powerful semi-automatic rifle that has become the preferred weapon of recent mass ... Cruz fired 139 rounds of 5.56-and-.223-caliber bullets during the rampage.
The AR-15/M16 can easily be converted to the 6×45mm with a simple barrel swap with few or no further modifications to the rifle. This is also true for rifles such as Ruger's Mini-14 and most bolt-action rifles chambered for the .223 Remington cartridge. [1]
The AR-15 uses an L-type flip, aperture rear sight and it is adjustable with two settings, 0 to 300 meters and 300 to 400 meters. [16] The front sight is a post adjustable for elevation. The rear sight can be adjusted for windage. The sights can be adjusted with a bullet tip or pointed tool. The AR-15 can also mount a scope on the carrying handle.
Bullets had the manufacturer code over the Quarter number and two-digit year of production engraved on the base (e.g. Pk/2-26 is Zaklady Amunicyjne, Pocisk, 2nd Quarter of 1926). 8mm Lebel "Balle D" bullets were differenced from 7.9mm Mauser bullets by a capital letter "D" inset between the contractor code and the date (e.g. Pk/D/2-26).
An AR-15 or similar rifles are semiautomatic, military-style weapons that can fire at least 30 rounds, the number of bullets a magazine typically carries, according to NPR. The term semiautomatic ...