초록 ▼

Apparatus for converting a firearm of a first caliber to fire cartridges of a second caliber. The regular bolt assembly of the firearm is removed and replaced with a conversion bolt assembly having a flat receiver plate which is bifurcated to provide a pair of flat rails. A bolt assembly is supporte

Apparatus for converting a firearm of a first caliber to fire cartridges of a second caliber. The regular bolt assembly of the firearm is removed and replaced with a conversion bolt assembly having a flat receiver plate which is bifurcated to provide a pair of flat rails. A bolt assembly is supported for movement along the rails, out of contact with the receiver of the firearm. The receiver plate of the conversion bolt assembly extends forwardly from a backplate which accurately locates the conversion assembly within the firearm, and the receiver plate is tilted to clear the conventional ejection port of the firearm. The conversion bolt assembly includes an automatic sear trip which enables full-automatic firing of second caliber cartridges on firearms that are so equipped, and also includes a weight for improved full-automatic operation. The disclosed embodiment is designed for use with an M-16 or AR-15 rifle.

대표청구항 ▼

Conversion bolt assembly apparatus for converting a firearm, having a receiver, a regular bolt assembly, a side ejection port, and a chamber which is chambered for cartridges of a first caliber, to fire cartridges of a second caliber by replacing the regular bolt assembly of the firearm, comprising,

Conversion bolt assembly apparatus for converting a firearm, having a receiver, a regular bolt assembly, a side ejection port, and a chamber which is chambered for cartridges of a first caliber, to fire cartridges of a second caliber by replacing the regular bolt assembly of the firearm, comprising, a backplate having means which engages a portion of the firearm so as to orient said backplate in predetermined relation to the receiver of the firearm; a receiver plate attached to and extending forwardly from said backplate and including a pair of spaced apart parallel rails which terminate at remote ends a distance from said backplate; a barrel assembly carried by said unsupported ends of said rails; said barrel assembly having means which is externally configured to fit in the chamber of the firearm and having a cartridge receiving chamber to receive a cartridge of said second caliber; a bolt guided by said rails for reciprocal movement between a forward position at said chamber of said barrel assembly and a rearward position; extractor means carried by said bolt and operative to withdraw a cartridge from said cartridge receiving chamber of said barrel assembly; and said rails being in a plane which is tilted relative to horizontal as said conversion bolt assembly is oriented within the firearm, so that the side ejection port of the firearm is not obstructed by said receiver plate.