Modular firearm and method for making the same

摘要

A modular firearm according to the present invention includes a breach face module receiver adapted for receiving a fully assembled breach face module. The breach face module includes a breach face and an extractor arm precisely located relative to the breach face for engaging a cartridge rim and ejecting the cartridge from the firearm. The extractor arm is pivotally mounted in the breach face module and is rotationally biased by an extractor spring to effect cartridge engagement. The location of the extractor arm and the size of the breach face are variable so that the breach face module can be adapted for use with a range of calibers. The exterior dimensions of the breach face module remain constant so that a single breach face module receiver may be used to manufacture firearms of various calibers.