: the pin that strikes the cartridge primer in the breech mechanism of a firearm
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The upper receiver includes such parts as the bolt group and the firing pin.—Nbc News, NBC news, 30 July 2025 Its release caused a sensation: The gun was pictured on the front page of the New York Post, with fears it could be smuggled past metal detectors onto planes (in fact, a metal detector would spot the gun’s metal firing pin and any ammunition).—Rajan Basra, WIRED, 5 July 2024 The grenade failed to detonate, as a red handkerchief wrapped around it stopped the firing pin from deploying quickly enough.—Meilan Solly, Smithsonian Magazine, 17 July 2024 The handgun was missing the magazine and the back plate and the firing pin.—L. M. Boyd, The Arizona Republic, 21 Mar. 2024 See All Example Sentences for firing pin
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