| 摘要 |
A firearm, such as a handgun, rifle, machine gun, etc. has a frame assembly having a barrel defining a cartridge chamber and includes a magazine for serially positioning cartridges at a pickup location relative to said frame assembly and barrel. A reciprocating member, such as a slide or bolt is provided in the firearm assembly for moving cartridges from said pickup location into the cartridge chamber of the barrel and for extracting the cartridge cases of spent cartridges from the cartridge chamber and ejecting them from said firearm. The reciprocating member is machined to define a breech face recess. A cartridge specific breech face element is removably secured within the breech face recess to adapt the firearm to fit a cartridge of desired caliber and configuration. The breech face element can be provided in specifically desired dimensions to compensate for wide tolerances or wear of the reciprocating member.
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