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What is Masterkey?
The Masterkey is a combination weapon featuring an M4 attached to a Winchester 12 gauge shotgun. It is named Masterkey for its common use as a door remover.
Have a locked door? Not anymore.
Masterkey - video
Masterkey - what is it?
A door-breaching shotgun manufactured as a custom part by Knight's Armament Company. Can be mounted under the barrel on a M4 or M16 assault rifle, like a M203 grenade launcher.
The Masterkey project was initiated during the 1980s to provide assault rifles with a potent built-in door breaching tool.