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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 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.
Barrel length Barrel profile Barrel twist Bayonet Lug Muzzle device R6000 AR-15 Sporter (SP1) A1 Triangular S-1 A1 No No .223 REM 20 in. A1 1:12 Yes Type 2 Duckbill or A1 R6001 AR-15 Sporter Carbine (SP1 Carbine) 2nd Generation Short Ribbed S-1 A1 No No .223 REM 16 in. A1 1:12 Yes A1 R6002 AR-15 Sporter (SP1; Bundled with 3× scope) A1 Triangular
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.
The Compliant model (designed for the California market) has a CAR-15 stock fixed in the open position (with an overall length of 33.75 inches) and comes with 10-round magazines. [ 14 ] The Smith & Wesson Performance Center target shooting version has an 18-inch bull barrel threaded to take any AR-15/M16-style compensator, a free-floated forend ...
After the introduction of the M4 carbine, it was found that the shorter barrel length of 14.5 inches also harms the reliability, as the gas port is located closer to the chamber than the gas port of the standard length M16 rifle: 7.5 inches instead of 13 inches. [97]
Pre-chambered "Drop-In Ready" barrels can be purchased, and the correct headspace is set using a proprietary barrel nut design. The barrel is threaded to fit the Ruger action threads. This way, a competent gunsmith only needs an AR-15 barrel wrench and proper headspace gauges to fit a new barrel. [14]
The initial SAINT offering was an AR-15 style rifle with a 16-inch (410 mm) barrel and chambered in 5.56 NATO, introduced in November 2016. [5] It was subsequently named the 2017 tactical gun of the year by American Rifleman magazine. [6] In November 2017, a pistol version including a forearm brace was introduced. [7]