: the pin that strikes the cartridge primer in the breech mechanism of a firearm
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The hammer caused a firing pin to strike the base of a cartridge, igniting the primer and firing the bullet.—Simon Akam, Vanity Fair, 2 Apr. 2026 The upper receiver includes such parts as the bolt group and the firing pin.—Nbc News, NBC news, 30 July 2025 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 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 See All Example Sentences for firing pin