Patent ID: 6732465
Filing Date: 2004-05-11
Classification: F41A

Abstract:
A semi-automatic handgun type firearm mechanism comprising:(a) a frame assembly having a barrel defining a cartridge chamber; (b) a magazine for serially positioning cartridges at a pickup location relative to said frame assembly and barrel; (c) a recoil actuated spring returned reciprocating slide member for moving cartridges from said pickup location into said cartridge chamber and for extracting the-cartridge cases of spent cartridges from said cartridge chamber and ejecting the same from said firearm said reciprocating slide member defining an end face and having an insert receptacle therein defining side walls and an internal force transmitting surface and intersecting said end face, said reciprocating member having a retainer shoulder; (d) an interchangeable breech face insert being located within said insert receptacle of said reciprocating member and having intimate surface to surface force transmitting engagement with said internal force transmitting surface, said breech face element being adapted to fit a cartridge of desired caliber and configuration and having a firing pin opening and threaded retainer opening therein; and (e) a retainer element being received by said threaded retainer opening and releasably securing said interchangeable breech face insert in force transmitting relation within said insert receptacle.