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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 ...
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The original idea was based on the Knight's Armament Company Masterkey system, which dates back to the 1980s and originally comprised a shortened, tube-fed Remington 870 shotgun mounted under an M16 rifle or M4 carbine. The M26-MASS improved upon the original Masterkey concept with a detachable magazine option and more comfortable handling ...
Electric locks are sometimes stand-alone with an electronic control assembly mounted directly to the lock. Electric locks may be connected to an access control system, the advantages of which include: key control, where keys can be added and removed without re-keying the lock cylinder; fine access control, where time and place are factors; and ...
The boxlock action as used in shotguns was the result of a long evolution of hammerless actions, created by two gunsmiths, Anson and Deeley, working for the Westley-Richards company in 1875. The contribution of Anson and Deeley was in the simple and elegant lock mechanism, which provided a hammerless action with fewer moving parts than exposed ...
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Since electromagnetic locks do not interact with levers or door knobs on a door, typically a separate release button that cuts the lock power supply is mounted near the door. This button usually has a timer that, once the button is pressed, keeps the lock unlocked for either 15 or 30 seconds in accordance with NFPA fire codes.