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[1] [2] The SOPMOD kit is composed mostly of non-developmental items and commercial off-the-shelf (NDI/COTS) accessories packaged together to support four M4A1 carbines. [ 1 ] [ 3 ] It allows for the attachment of any Picatinny compatible accessory that fits the length of the weapon.
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 Colt ACC-M (Advanced Colt Carbine-Monolithic) adds Colt's proprietary, monolithic Mil-Std-1913 rail system (quad rail) forward hand guard to the normal M4 carbine upper receiver. Colt M4 Carbines and Colt M4A1 Carbines can be easily and relatively inexpensively modified/upgraded into ACC-Ms by replacing the upper receiver, which is more ...
The M4 carbine (officially Carbine, Caliber 5.56 mm, M4) is a 5.56×45mm NATO assault rifle developed in the United States during the 1980s. It is a shortened version of the M16A2 assault rifle. The M4 is extensively used by the US military , with decisions to largely replace the M16 rifle in US Army (starting 2010) and US Marine Corps ...
The United States military, as well as other special forces and police around the world, use KAC RIS/RAS conversions for many popular firearms, including the American M16/M4 rifles and Heckler & Koch MP5 series submachine guns. The RIS/RAS system allows for the mounting of accessories to firearms without additional tools or modifications.
The Barrett REC7 (designation stands for "reliability-enhanced carbine") [1] is an American firearm manufactured as a selective-fire fully-automatic and semi-automatic rifle by Barrett Firearms. It is an M4 carbine utilizing a short-stroke gas piston system and is available in either 5.56×45mm NATO or 6.8mm Remington SPC.
1:14: 1 right hand twist every 14 inches (356 mm) .222 Remington or .223 Remington (US M193) 1:12: 1 right hand twist every 12 inches (305 mm) .223 Remington (US M193) or 7.62×39mm; 1:10: 1 right hand twist every 10 inches (254 mm) 9×19mm NATO; 1:9: 1 right hand twist every 9 inches (229 mm) .223 Remington & 5.56×45mm NATO