A raid in a insurgent held village, rocking a M4A1 build featuring a Knight's
Armament Company Masterkey attachment.

Hope you guys enjoy this one.

The Masterkey is a door breaching shotgun system manufactured by Knight's Armament Company.
The Masterkey project was initiated during the 1980s to provide assault rifles with a potent builtin 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 pumpaction shotgun mounted on an M16 or M4 assault rifle in an underbarrel configuration, much like the M203 grenade launcher. It has a 3round internal tubular magazine and can carry an additional round in the chamber, for a total of 4 rounds.