12ga UB Shotgun
The Knight's Armament Masterkey is a door breaching shotgun (often mounted on the M4A1 Carbine or similar weapons). The Masterkey project was initiated during the 1980s to provide assault rifles with a potent built-in door breaching tool. 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 Remington 870 12 gauge pump-action shotgun mounted on an M16 or M4 assault rifle in an underbarrel configuration, much like the M203 grenade launcher. It has a 3-round internal magazine and can carry a fourth round in the chamber.
Tom Clancy's The Sum of All Fears
The 12ga UB Shotgun is a gadget featured in Tom Clancy's The Sum of All Fears. It is available for use on the M4A1.
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