'Firing pin' definitions:
Definition of 'firing pin'
(from WordNet)
noun
Striker that ignites the charge by striking the primer
Definition of 'Firing pin'
From: GCIDE
- Firing pin \Fir"ing pin`\ In the breech mechanism of a firearm, the pin which strikes the head of the cartridge and explodes it. [Webster 1913 Suppl.]