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The M-LOK rail specification included metric dimensions instead of imperial, and utilizes a T-slot nut capable of only 90-degree rotation, reinforced by thread-locking fluid, making it suited for applications on free-floating handguards. It was designed to work with both metal and polymer parts.
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.
It is similar in concept to the earlier commercial Weaver rail mount used to mount telescopic sights, but is taller and has wider slots at regular intervals along the entire length. The MIL-STD-1913 locking slot width is 0.206 in (5.23 mm). The spacing of slot centres is 0.394 in (10.01 mm) and the slot depth is 0.118 in (3.00 mm). [8]
The mount consisted of a rectangular steel firing platform with a pivot at the front and two wheels at the front and rear to give 120° of traverse. The recoil system for the M1877 consisted of a U-shaped gun cradle which held the trunnioned barrel and a slightly inclined firing platform with a hydro-gravity recoil system.
The handguard was made from full-length rifle handguard by cutting it in half and using either the fore or aft pair, after machining the ends to fit the slip ring and handguard cap. Because of the short barrel, the CAR-15 SMGs suffered from a loud and bright muzzle blast, and a number of muzzle devices were developed to reduce this.
At 11.5 lb (5 kg), the M192 is 6.5 lb (3 kg) lighter than its predecessor. [2] Unlike the M122, its rear legs are independently movable and stored in a forward position. Because of this design, there is no need for a locking bar connecting the two legs. [3] Additionally, the M192 features an integrated traversing and elevation (T&E) mechanism.
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 5-inch (127 mm)/54-caliber (Mk 45) lightweight gun is a U.S. naval artillery gun mount consisting of a 5 in (127 mm) L54 Mark 19 gun on the Mark 45 mount. [1] It was designed and built by United Defense , a company later acquired by BAE Systems Land & Armaments , which continued manufacture.