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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.
Barrel nut Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.
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 Barrett M468 was a variant of the M4 Carbine, rechambered for a heavier and larger 6.8mm bullet for increased terminal performance. The designation of M468 stands for an M4 carbine chambered for the 6.8mm SPC cartridge. It was an attempt to create an optimal Special Operations close-to-medium range carbine for Close Quarter Battle (CQB).
The standard M203 is intended for permanent attachment to the M16A1, M16A2 and M16A3 rifles, and utilizes a 12 in (30 cm) rifled barrel. The M203 unmodified to an A1/A2 series will not fit on the M4 carbine series. The U.S. M203A1 has a barrel of 12 inches, while the SOPMOD M203A1 has a 9 in (23 cm) barrel. The M203A1 is intended for use with ...
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 original idea was based on the Knight's Armament Company Masterkey system, which dates back to the 1980s and originally comprised a shortened, tube-fed Remington 870 shotgun mounted under an M16 rifle or M4 carbine. The M26-MASS improved upon the original Masterkey concept with a detachable magazine option and more comfortable handling ...
It forms part of the NATO standard STANAG 2324 rail. It was originally used for mounting of telescopic sights atop the receivers of larger caliber rifles . Once established as United States Military Standard , its use expanded to also attaching other accessories, such as: iron sights , tactical lights , laser sights , night-vision devices ...