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Note that this M26-MASS is missing the front sight folded over the barrel. Left side of M26-MASS showing bolt handle. The M26-MASS is a lightweight underbarrel shotgun configured to be secured to a main rifle, developed by C-More Systems and manufactured by Vertu Corporation [3] and originally marketed toward special operations forces.
Independent stocks and grips for the 870 are available for use, but they are incompatible with the M16 barrel mount. KAC makes an independent stock for the Masterkey that also can be used with the M203 grenade launcher. The Masterkey inspired the M26 Modular Accessory Shotgun System, an attachable shotgun in use with the United States Army. The ...
Barrel length Barrel profile Barrel twist Bayonet Lug Muzzle device R6000 AR-15 Sporter (SP1) A1 Triangular S-1 A1 No No .223 REM 20 in. A1 1:12 Yes Type 2 Duckbill or A1 R6001 AR-15 Sporter Carbine (SP1 Carbine) 2nd Generation Short Ribbed S-1 A1 No No .223 REM 16 in. A1 1:12 Yes A1 R6002 AR-15 Sporter (SP1; Bundled with 3× scope) A1 Triangular
All current M16-type rifles can mount under-barrel 40 mm grenade launchers, such as the M203 and M320. Both use the same 40×46mm LV grenades as the older, stand-alone M79 grenade launcher . The M16 can also mount under-barrel 12 gauge shotguns such as KAC Masterkey or the M26 Modular Accessory Shotgun System .
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.
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]
A rail system mounted on top of a SIG SG 550 A dovetail rail on a rifle receiver for mounting a sight. A rail integration system (RIS; also called a rail accessory system (RAS), rail interface system, rail system, mount, base, gun rail, or simply a rail [1]) is a generic term for any standardized attachment system for mounting firearm accessories via bar-like straight brackets (i.e. "rails ...
Casemate-mounted 5"/50 caliber gun on the USS North Dakota. A casemate is an armoured structure consisting of a static primary surface incorporating a limited-traverse gun mount: typically, this takes the form of either a gun mounted through a fixed armour plate (typically seen on tank destroyers and assault guns) or a mount consisting of a partial cylinder of armour "sandwiched" between ...