firing-pin

firing pin

noun Ordnance.
a plunger in the firing mechanism of a firearm or cannon that strikes the cartridge primer, igniting the propelling charge.

Origin:
1870–75

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World English Dictionary
firing pin
 
n
the part of the firing mechanism of a firearm that ignites the charge by striking the primer

Collins English Dictionary - Complete & Unabridged 10th Edition
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