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Definition of Pinfire
1. a. Having a firing pin to explode the cartridge; as, a pin- fire rifle.
Definition of Pinfire
1. Noun. (context: firearms) An obsolete kind of brass cartridge in which the priming compound is ignited by striking a small pin which protrudes radially from just above the base of the cartridge. ¹
¹ Source: wiktionary.com