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auto sear

From Wiktionary, the free dictionary

English

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Noun

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auto sear (plural auto sears)

  1. (firearms) A device which allows for a closed-bolt self-loading firearm to reliably function in fully automatic fire by preventing the hammer or striker from falling until the bolt is fully in battery.
    Hyponyms: drop-in auto sear, DIAS, Glock switch
    Coordinate term: bump stock