Modular firearm lower receiver assembly for rapid conversion of ar-15 type firearms to a bullpup configuration and method of assembly thereof

Abstract

A modular firearm lower receiver assembly for rapid conversion of conventionally configured modular firearms to a bullpup configuration and the method of assembly thereof.

What is claimed is: 
     
         1 - 2 . (canceled) 
     
     
         3 . A system for bull-pup configuration, comprising:
 a lower receiver;   a lower receiver bull-pup interface having a pistol grip and trigger guard configured to be interlocked to an upper receiver assembly of a firearm, the lower receiver bull-pup interface having a forward end, a rear end, and a channel therebetween for accepting the upper receiver assembly, the rear end of the bull-pup interface having opposing upperwardly facing hook portions configured to overlap pivot pin apertures of the lower receiver and to accept a pivot pin;   a trigger relocation assembly configured to be coupled between a trigger of the lower receiver and a trigger of the bull-pup interface; and   a recoil buffer and recoil spring of the lower receiver, configured to be interfaced to the firearm.   
     
     
         4 . The system of  claim 3  wherein the lower receiver houses a fire control unit. 
     
     
         5 . The system of  claim 3  wherein the lower receiver further comprises an ammunition magazine well. 
     
     
         6 . The system of  claim 3  wherein the lower receiver further comprises captured receiver pins. 
     
     
         7 . The system of  claim 3  wherein the trigger relocation assembly comprises a levered trigger linkage system. 
     
     
         8 . The system of  claim 3  wherein the trigger relocation assembly is configured to activate a levered trigger. 
     
     
         9 . The system of  claim 3  wherein the trigger relocation assembly is configured to activate a levered trigger in a fire control unit. 
     
     
         10 . A system for converting a rifle assembly to a bull-pup configuration, comprising:
 a lower receiver housing a fire control unit and having an ammunition magazine well;   a lower receiver bull-pup interface having a pistol grip and trigger guard configured to be interlocked to an upper receiver assembly of a firearm, the lower receiver bull-pup interface having a forward end, a rear end, and a channel therebetween for accepting the upper receiver assembly, the rear end of the bull-pup interface having opposing upperwardly facing hook portions configured to overlap pivot pin apertures of the lower receiver and to accept a pivot pin;   a trigger relocation assembly configured to be coupled between a trigger of the lower receiver and a trigger of the bull-pup interface; and   a recoil buffer and recoil spring of the lower receiver configured to be interfaced to the firearm.   
     
     
         11 . The system of  claim 10  wherein the lower receiver further comprises captured receiver pins. 
     
     
         12 . The system of  claim 10  wherein the trigger relocation assembly comprises a levered trigger linkage system. 
     
     
         13 . The system of  claim 10  wherein the trigger relocation assembly is configured to activate a levered trigger. 
     
     
         14 . The system of  claim 10  wherein the trigger relocation assembly is configured to activate a levered trigger in a fire control unit. 
     
     
         15 . A system for converting a rifle assembly to a bull-pup configuration, comprising:
 a lower receiver housing a fire control unit and having captured receiver pins;   a lower receiver bull-pup interface having a pistol grip and trigger guard, configured to be interlocked to an upper receiver assembly of a firearm, the lower receiver bull-pup interface having a forward end, a rear end, and a channel therebetween for accepting the upper receiver assembly, the rear end of the bull-pup interface having opposing upperwardly facing hook portions configured to overlap pivot pin apertures of the lower receiver and to accept a pivot pin;   a trigger relocation assembly configured to be coupled between a trigger of the lower receiver and a trigger of the bull-pup interface; and   a recoil buffer and recoil spring of the lower receiver configured to be interfaced to the firearm.   
     
     
         16 . The system of  claim 15  wherein the lower receiver has an ammunition magazine well. 
     
     
         17 . The system of  claim 15  wherein the lower receiver further comprises an ammunition magazine well. 
     
     
         18 . The system of  claim 15  wherein the trigger relocation assembly comprises a levered trigger linkage system. 
     
     
         19 . The system of  claim 15  wherein the trigger relocation assembly is configured to activate a levered trigger. 
     
     
         20 . The system of  claim 15  wherein the trigger relocation assembly is configured to activate a levered trigger in a fire control unit.