Multi-caliber conversion kits for semi-automatic pistols

Abstract

A multi-caliber modular center fire line of conversion kits adaptable to pistols such as the Colt Government Model Pistol or new semi-automatic handguns. Said kits consist of complete slide assemblies using interchangeable components adapted to different sizes of ammunition. All barrels in the kits have external dimensions identical to those of the largest caliber one in order to have the primer of a loaded cartridge, whatever its caliber, automatically centered in front of the firing pin hole on the breech inside a locked pistol. When installed on semi-automatic pistol frames, kits function exactly like the original handgun.

1 - 3 . (canceled) 
     
     
         4 . A multi-caliber line of modular center fire conversion kit using interchangeable barrels of different calibers and lengths in a same type of slide assembly made to fit Colt Government Model Pistol frames, their copies, variants or new pistols, comprising:
 (A) slides as set forth on  claim 4  using interchangeable external extractors but having otherwise internal specifications identical to those of a standard .45 Colt Government Model Pistol slide;   (B) interchangeable barrels of different calibers ( FIG. 1 ) having otherwise external specifications identical to those of standard .45 Colt Government Model Pistol barrels in order to fit slides as set forth on claim (A); or   (C) interchangeable barrels of different calibers with extended feed ramp of a type already in production ( FIG. 2 ) having otherwise specifications as set forth on claim (B) but which installation on standard Colt Government Model Pistol type frames require either a longitudinal cut milled in top front part of the magazine well of said frames ( FIG. 6   c ) or new frames originally made with such modification;   (D) barrel bushings, recoil spring guides and recoil spring plugs of a type usable on standard Colt Government Model Pistol slides, recoil springs, extractors, ejectors and magazines adapted to the type of ammunition used in the kit;   (E) interchangeable short feed ramp linkless barrels of different calibers with the usual pivoting link assembly replaced by integral underside locking ramps ( FIG. 3 ) but having otherwise external specifications as set forth on claim (B); or   (F) interchangeable linkless barrels as set forth on claim (E) except for having an extended feed ramps and locking ramps ( FIG. 4 ) of a different design which installation on Colt Government Model Pistol type frames require either a longitudinal cut milled in top front part of the magazine well of said frames ( FIG. 6   c ) or new frames originally made with such modification;   (G) removable locking blocks ( FIG. 5 ) having integral recoil spring guides  a  and inclined top lugs  b which engage the corresponding locking ramps of linkless barrels as set forth on claims (E) and (F);   (H) barrel bushings as set forth on claim (D) and drilled recoil spring plugs of a type usable on standard Colt Government Model Pistol slides, recoil springs, extractors, ejectors and magazines adapted to the type of ammunition used in the kit; or   (I) slides as set forth on  claim 4  but having enlarged ejection ports instead of the usual Colt Government Model Pistol type twin internal locking grooves, flat internal sides from the breech to half an inch of the internal front end in order to use standard barrel bushings as set forth on claim (D), drilled recoil spring plugs as set forth on claim (H) and squared chamber barrels as set forth on claim (J) installed from the bottom of the slide ( FIG. 9 );   (J) interchangeable linkless short feed ramp barrels of different calibers and lengths ( FIG. 7 ) having on top of their squared chambers integral extensions which interlock in the enlarged ejection port of slides as set forth on claim (I), and designed to have, regardless of their calibers, external specification corresponding to the internal specification of said slides;   (K) barrel bushings as set forth on claim (D), drilled recoil spring plugs as set forth on claim (H), removable locking block as set forth on claim (G), recoil springs, extractors, ejectors and magazine adapted to the type of ammunition used in the kit;. or   (L) slides as set forth on claim (I) but having longer flat internal sides going from the breech to the internal front end of said slide, and circular apertures for barrel and recoil spring guides on their integral muzzle ends ( FIG. 10 ) thus requiring no barrel bushings and recoil spring plugs;   (M) interchangeable linkless barrels as set forth on claim (J) except for having an extended feed ramp and locking ramps of a different design ( FIG. 8 ) which installation on Colt Government Model Pistol type frames require either a longitudinal cut milled in top front part of said frames magazine well ( FIG. 6   c ) or new frames originally made with such modification;   (N) removable locking block as set forth on claim (G), extractors, ejectors and magazine adapted to the type of ammunition used in the kit.