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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.
Barrel length Barrel profile Barrel twist Bayonet Lug Muzzle device M16 PIP: A2 Ribbed S-1-F, S-1-3 A2 Yes Yes 5.56 NATO 20 in. A2 1:7 Yes A1 or A2 Colt Advanced Combat Rifle: Retractable ACR ACR Type S-1-3 or S-1-F Flattop Yes Yes 5.56 NATO 20 in. A2 1:7 No ACR compensator M231 FPW: FPW Wire Short Round S-F None No No .223 REM 15.6 in. HBAR 1: ...
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]
The Heckler & Koch HK416 is an assault rifle chambered for the 5.56×45mm NATO cartridge.It is designed and manufactured by the German company Heckler & Koch.. Although the design is based on the AR-15 class of firearm (specifically the Colt M4 carbine family issued to the U.S. military), it uses a proprietary short-stroke gas piston system from Heckler & Koch's earlier G36 family of rifles.
Arguably, the criticisms about range, accuracy, and lethality are related to the change in barrel length and twist between the M16 and M4. The earlier 5.56 rounds (the original M193) were optimized for a 20-inch (51 cm) barrel with a 1:12 twist. In 1980 STANAG 4172 defined the 5.56×45mm NATO chambering and its accompanying 1:7 twist rifling. [38]
Barrel manufacturers include X-Caliber, McGowen, AR Precision, and PAC-NOR. By the end of April 2016, more than 1,000 .277 Wolverine barrels had been sold, with more than 2,000 by mid-November 2017. [citation needed] Barrels lengths include: 8.2, 10.5, 12.5, and 14.5 inch pistol; 16, 18, and 20 inch rifle.
The IWI Carmel is a short-stroke, gas-piston operated rifle chambered in 5.56x45mm, similar to the CZ BREN 2 and the FN SCAR-L.The free-floating barrel is chrome lined and cold hammer-forged, with a 1:7 twist rate and available in a variety of barrel lengths: 10.5", 12", 14.5" and 16".