The weapon is named "Masterkey" in reference to its ability to "unlock" virtually any standard lock. Is there a master key for all locks Any key that can open two or more locks is considered a master key. Shotguns also come in a range of firearm. The so-called Breaching Shotgun, a combination of a 12-gauge shotgun and a powerful rifle, was a collaborative project that involved several engineers and designers within the Lab’s National and Homeland Security Division. Shotguns come in a wide variety of sizes, most popular being 12 gauge and 20 gauge. Shotguns use the energy of a fixed shell to fire a number of small pellets called shot, or a solid projectile called a slug. The M26 was chosen by the Army over the Masterkey as a breaching tool. The shotgun is a versatile firearm designed to normally be fired from the shoulder. The Masterkey inspired the M26 Modular Accessory Shotgun System, an attachable shotgun in use with the United States Army. KAC makes an independent stock for the Masterkey that also can be used with the M203 grenade launcher. Independent stocks and grips for the 870 are available for use, but they are incompatible with the M16 barrel mount. The shotgun can only be awkwardly operated independently because it has no grip behind the trigger-when firing the Masterkey, the rifle's magazine must be used as a makeshift pistol grip. It has a 3-round internal magazine and can carry a fourth round in the chamber. 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. Individual soldiers were often forced to carry a breaching shotgun in addition to their standard issue rifle, but the Masterkey removes this need. The Masterkey project was initiated during the 1980s to provide assault rifles with a potent built-in door breaching tool. The Masterkey is a door breaching shotgun system manufactured by Knight's Armament Company. Masterkey shotgun mounted on an M4A1 carbine
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