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Individual soldiers were often forced to carry a breaching shotgun in addition to their standard-issue rifle, but the Masterkey removes this need. The system consists of a shortened Remington 870 12 gauge pump-action intended to be mounted under a firearm's barrel, similarly to the M203 grenade launcher. It has a 3-round internal tubular ...
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.
Addition of a rifled barrel to a shotgun to allow it to better fire shotgun slugs; Accurizing; Sporterizing; Some commonly customized firearms include the Ruger 10/22 carbine, the M1911 pistol, and the AR-15 rifle, all of which have large numbers of aftermarket parts suppliers.
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.
The documentation for the kit does not require a rewrite if improved replacements for any of the current items can be found. As a result, this content list has changed over time. Several potential additions include the KAC Masterkey Shotgun, the M26 Modular Accessory Shotgun System, and the M320 grenade launcher. [3]
The sleeve's barrel must be thick enough to provide structural integrity to the barrel, and so requires a large enough internal barrel diameter to hold the new barrel. One manufacturer has a .40 caliber (10 mm) minimum diameter for these inserts [ 5 ] in .22 rimfire caliber.
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The Ciener Ultimate Over/Under system is a modified shotgun designed by Johnathan Arthur Ciener. It is mounted under an M16 variant in order to facilitate CQB combat. It is similar to, but uses a different mounting system than the Knight's Armament Company Masterkey or the accessory weapon configuration of the Remington 870 MPS.