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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]
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]
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 Armada is a select-fire rifle composed of two receivers (upper and lower) manufactured in forged aluminum, uses a 22 in (560 mm) barrel with a 1:9 right-hand twist (able to stabilize both M193 "Ball" and SS109/M855 variants of the 5.56mm cartridge), Norinco CQ-style plastic parts (grip, stock, handguard), flip-up rear sight adjustable for ...
M21-5 CQB Carbine with 10.5 inch long barrel; M21-5 Carbine with 14.5 inch barrel; M21-5 Standard with 16-inch barrel; M21-5 DMR Sniper rifle with 18-inch barrel; The rifle features ambidextrous control levers for the magazine release and safety. [citation needed]