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The quarter-turn T-slot nuts have different torque specifications depending on the handguard material: 4.0 N⋅m (35 lb⋅in) for attaching metal accessories to metal handguards. 1.7 N⋅m (15 lb⋅in) for attaching polymer or metal accessories to polymer handguards. 1.7 N⋅m (15 lb⋅in) for attaching polymer accessories to metal handguards.
The barrel is fastened to the receiver with a special nut, which can be removed with a wrench. The barrel is forged using a cold hammer process. It features a chrome-lined bore with 6 right-hand grooves and a 1 in 178 mm (1:7 in) rifling twist rate.
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.
A free-floating barrel is a firearm design used in precision rifles, particularly match grade benchrest rifles, to accurize the weapon system. With conventional rifles, the gun barrel rests in contact with the fore-end of the gunstock , sometimes along the whole length.
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.
G3A2: G3 developed in 1962 with new rotating drum rear sight and a Freischwinger (FS) free-floating barrel that significantly improved accuracy. G3A3 : The most well known 1963 version. Drum sights with an improved front sight, a flash-suppressor/muzzle brake capable of firing NATO standard grenades, a fixed solid plastic buttstock, and a ...
[1] It is capable of using the 7.62mm M80A1 as well as the newer M1158 advanced armor piercing rounds which can penetrate modern body armor the 5.56mm M855A1 cannot. [14] [15] The M110A1 features a Geissele M-LOK rail handguard, Geissele adjustable two-stage trigger, Geissele optic mount, OSS SRM6 suppressor, and 6-9 Harris bipod and mount. [1] [8]
The Adaptive Combat Rifle (ACR) is a modular assault rifle formerly designed by Magpul Industries of Austin, Texas, and known initially as the Masada.. In late January 2008, Bushmaster Firearms International entered into a licensing agreement with Magpul whereby Bushmaster would take over production, future development, and sales of the Masada. [5]