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The casings and chambers .223 Remington and 5.56×45mm NATO are virtually the same dimensions, but due to the fact that .223 Remington is designed to handle much lower pressures than the 5.56×45mm NATO the rounds are not completely interchangeable. Firing a 5.56×45mm NATO round out of a rifle chambered in .223 Remington could be injurious or ...
The first version produced for commercial sale by Colt was the SP1 model AR-15 Sporter in .223 Remington, with a 20-inch (51 cm) barrel and issued with five-round magazines. [21] Initial sales of the Colt AR-15 were slow, primarily due to its fixed sights and carry handle that made scopes difficult to mount and awkward to use. [81]
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 table below gives a list of firearms that can fire the 5.56×45mm NATO cartridge, first developed and used in the late 1970s for the M16 rifle, which to date, is the most widely produced weapon in this caliber. [1] Not all countries that use weapons chambered in this caliber are in NATO. This table is sortable for every column.
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.
Headstamp of a .50 caliber cartridge casing made at the Lake City Army Ammunition Plant in 1943 and recovered from the Sahuarita Bombing and Gunnery Range in 2012. Lake City Army Ammunition Plant (LCAAP) is a 3,935-acre (15.92 km 2) U.S. government-owned, contractor-operated facility in northeastern Independence, Missouri.
The Haenel MK 556 [2] (German: Maschinenkarabiner) [3] is a gas-operated selective-fire 5.56×45mm NATO assault rifle designed by German company C.G. Haenel.The MK556 was finalised in September 2020, and it is a fully automatic version of an earlier Haenel design, the CR 223, which was already in limited use by law enforcement agencies since 2017. [4]
First manufactured 7.62×39mm Soviet rounds in 2002, NATO-standard 5.56×45mm NATO and 7.62×51mm NATO rounds in 2005 (earning the NATO interchangeability rating in 2006), and sporting .223 Remington and .308 Winchester rounds in 2012. The headstamp has the caliber at 12 o'clock, manufacturer's code at 6 o'clock, 2-digit year of production at 3 ...