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The Special Operations Peculiar MODification (SOPMOD) kit is an accessory system for the M4A1 carbine, CQBR, FN SCAR Mk 16/17, HK416 and other weapons used by United States Special Operations Command (USSOCOM) special forces units, though it is not specific to SOCOM.
The Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.
The M4 carbine barrel is 368 mm (14.5 in) and the XM8 barrel is 317 mm (12.5 in) but the rifles have the same overall length. Although a shorter barrel generally results in lower muzzle velocity, Polygonal rifling partially compensates for the loss of velocity from a shorter barrel. An electronic round counter was proposed for the XM8.
An 18-inch (457 mm) (MOD 0/1) or 16-inch (406 mm) (MOD H) threaded-muzzle match-grade free floating stainless steel heavy barrel with a 1:7 (178 mm) rifling twist ratio is standard for the SPR. [11] [3] [13] The barrels are manufactured by Douglas Barrels with a unique contour that reduced weight but maintained rigidity for accuracy. [14]
The .458 SOCOM (11.63×40mmRB) is a moderately large round designed to work in an AR-15 platform.This is achieved by installing a 458 bolt and barrel. The 300-grain (19 g) round offers a supersonic muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft⋅lbf (3,261 J), [1] similar to a light .45-70 but with a much smaller case.
D10RS variant with a 10.4-inch barrel. Used by Naval Special Warfare and JSOC. HK417: 7.62×51mm NATO: Battle rifle Germany: Adopted as a battle rifle and marksman rifle by Naval Special Warfare and JSOC units. Mk 16 Mod 0 + MK17 Mod 0: 5.56×45mm NATO: Assault rifle (SCAR L), Battle Rifle (SCAR H) Belgium United States: Used by all branches of ...
The gun's short recoil operating system causes the barrel to reciprocate, similar to the M2 machine gun. This combined with a gas system to minimize recoil balances positive and negative recoil forces, allowing a gunner to fire a round with significantly greater energy but with the recoil profile similar to a 7.62 mm round from an M240.
The ShAK-12, (Russian: ШАК-12) originally under the name ASh-12.7 (АШ-12.7, which stands for "Автомат штурмовой 12.7мм" or "automatic assault carbine 12.7mm") battle rifle is a dedicated CQB/Urban Operations weapon, developed by TsKIB SOO ("Central Design and Research Bureau of Sporting and Hunting Arms"), [2] a subsidiary of the KBP Instrument Design Bureau of Tula ...