(1) A manually operated mechanical device which prevents cartridges from being fed from the magazine into the loading mechanism. This device can be used to convert an automatic, semiautomatic, or bolt action firearm to fire single shot.
(2) A mechanical device that is employed in firearms so that only one cartridge or shotgun shell will feed into the carrier, or lifter, with each cycle of the breech mechanism. Also known as shell stop or cartridge stop.
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