: 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 According to investigators, the firing pin struck the primer, but the weapon failed to discharge.—
Michael Ruiz,
Fox News,
8 May 2024 The handgun was missing the magazine and the back plate and the firing pin.—The Arizona Republic,
21 Mar. 2024 See All Example Sentences for firing pin