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On December 8, 2010, Adcor announced production of the A-556 rifle to the civilian market. On June 27, 2011, it was announced that the improved A-556 Elite variant would be available for sale to the public. In June 2012, a soldier was seen in Afghanistan with a A-556 upper receiver with a 10.5 inch barrel on an M4 lower receiver. [4]
The rifle is available with four barrel lengths and can be easily converted from a standard rifle (with a 16.5 inch barrel) into a carbine (with a 14.5 inch barrel), into a compact rifle (with a 10.5 inch barrel), or into a designated marksman rifle (with an 18-inch barrel) without any tools. Barrel lengths of the two calibres are exactly the same.
The IWI US Zion-15 is an AR-15–style rifle assembled in Middletown, Dauphin County, Pennsylvania by IWI US, originally released in 2020.Marketed at a competitively low price, it is considered to be a budget or entry level rifle designed for American consumers optimized for home defense or competition, chambered in 5.56 NATO.
The Ruger AR-556 is a semiautomatic AR-15 style rifle manufactured by U.S. firearms company Sturm, Ruger & Co. Introduced in 2014 as an entry-level AR-15 using a direct impingement action, with variants since being released such as the upgraded AR-556 MPR (multi-purpose rifle) in 2017 [1] and the AR-556 pistol in 2019.
The standard M4 Type Carbine features a permanently fixed "Izzy" flash suppressor attached to a 14.5 in (370 mm) barrel, which brings the barrel to a total length of 16 in (410 mm). Bushmaster also produces the Patrolman's Carbine variant which features the more common removable "bird cage" flash suppressor, attached to a 16 in (410 mm) barrel ...
The weapon is available in semi-automatic and select-fire configurations with four barrel lengths and differing manufacturer stated effective ranges: [10] CAR816 personal defence weapon with a 191 mm (7.5 in) barrel; effective range 200 m (219 yd) CAR816 compact with a 267 mm (10.5 in) barrel; effective range 300 m (328 yd)
The shorter 14.5-inch (37 cm) barrel of the M4 carbine (with a STANAG 4172 conform 1:7 twist and M855/SS109 5.56 rounds^) generates significantly lower muzzle velocity, reducing the likelihood that the bullet will upset (yaw, fragment, or expand) in the target and resulting in less significant wounds.
The LWRC PSD is an ultra-short barrel carbine with an 8-inch barrel and Magpul CTR stock. Derived from the M6A2 carbine, it comes chambered in 5.56mm NATO or 6.8mm Remington SPC. [ 11 ] It is also available without a stock as the M6A2-P Pistol, but is semi-automatic and also chambered in 5.56mm and 6.8mm Remington SPC.