Chamber adaptor incorporated into a modified action assembly for permitting substitution of a first manufacturer specified cartridge for a second substitute cartridge

Abstract

A retrofit chamber adaptor associated with a substitute action assembly incorporated into a firearm for permitting the substitution of an original designated cartridge for a substitute cartridge. An elongated body is incorporated into a barrel accessible location of the firearm and supporting a bolt in reciprocating fashion. The chamber adaptor is mounted to forward end of the body in communication with the reciprocating bolt and exhibits a modified diameter aperture extending therethrough and corresponding to an incremental modification in diameter associated with the substitute cartridge. Additional features include a receiver plate incorporated into the body and exhibiting a generally lengthwise extending notched or keyed interior established between generally parallel extending sides with identified and interiorly notched locations for seating in reciprocating fashion therebetween the reciprocating bolt. A further variation of the adaptor exhibits a dual rail configuration to which is reciprocally mounted the bolt and from which in turn forwardly projects a firing pin. In a preferred application, the chamber adaptor permits substitution of a 0.22 LR rimfire cartridge in lieu of a normally designated 5.7×28 mm center fire cartridge.

1 . A retrofit chamber adaptor associated with a substitute action assembly incorporated into a firearm for permitting the substitution of an original designated cartridge for a substitute cartridge, said assembly comprising:
 an elongated body incorporated into a barrel accessible location of the firearm and supporting a bolt in reciprocating fashion; and   said chamber adaptor mounted to forward end of said body in communication with said bolt and exhibiting a modified diameter aperture extending therethrough corresponding to an incremental modification in diameter associated with the substitute cartridge.   
     
     
         2 . The assembly as described in  claim 1 , said body further comprising of a receiver plate exhibiting a generally lengthwise extending notched or keyed interior, established between generally parallel extending sides with identified and interiorly notched locations (for seating a reciprocating bolt. 
     
     
         3 . The assembly as described in  claim 1 , said body further comprising a dual rail configuration to which is reciprocally mounted said bolt and from which in turn forwardly projects a firing pin. 
     
     
         4 . The assembly as described in  claim 1 , said chamber adaptor exhibiting a specified shape and size and permitting substitution of a 0.22 LR rimfire cartridge in lieu of a normally designated 5.7×28 mm center fire cartridge. 
     
     
         5 . A retrofit chamber adaptor associated with a substitute action assembly incorporated into a firearm for permitting the substitution of an original designated cartridge for a substitute cartridge, said assembly comprising:
 an elongated body incorporated into a barrel accessible location of the firearm and supporting a bolt in reciprocating fashion, said body further comprising of a receiver plate exhibiting a generally lengthwise extending notched or keyed interior, established between generally parallel extending sides with identified and interiorly notched locations (for seating a reciprocating bolt; and   said chamber adaptor mounted to forward end of said body in communication with said bolt and exhibiting a modified diameter aperture extending therethrough corresponding to an incremental modification in diameter associated with the substitute cartridge.   
     
     
         6 . A retrofit chamber adaptor associated with a substitute action assembly incorporated into a firearm for permitting the substitution of an original designated cartridge for a substitute cartridge, said assembly comprising:
 an elongated body incorporated into a barrel accessible location of the firearm and supporting a bolt in reciprocating fashion, said body further comprising a dual rail configuration to which is reciprocally mounted said bolt and from which in turn forwardly projects a firing pin; and   said chamber adaptor mounted to forward end of said body in communication with said bolt and exhibiting a modified diameter aperture extending therethrough corresponding to an incremental modification in diameter associated with the substitute cartridge.