Lower receiver for a firearm

Abstract

A lower receiver for a modular firearm can include a first receiver portion that is removably attachable to a second receiver portion to form the lower receiver. An inner surface of the first receiver portion and an inner surface of the second receiver portion can together define a magazine cavity that is configured to receive a magazine. The lower receiver can be disassembled to provide easy access to inner regions of the lower receiver for cleaning, maintaining, or inspecting the modular firearm.

1 . A lower receiver for a modular firearm, the lower receiver comprising:
 a first receiver portion; and   a second receiver portion configured to mate with the first receiver portion along a mating surface, wherein an inner surface of the first receiver portion and an inner surface of the second receiver portion together define a magazine cavity configured to receive a magazine.   
     
     
         2 . The lower receiver of  claim 1 , wherein the mating surface is located along a vertical plane that bisects the lower receiver from a front side surface to a rear side surface. 
     
     
         3 . The lower receiver of  claim 1 , wherein the magazine cavity comprises a magazine opening along a bottom side surface of the lower receiver, and wherein the magazine opening is defined by a surface that slopes downward toward a front side surface of the lower receiver. 
     
     
         4 . The lower receiver of  claim 1 , further comprising a plurality of finger recesses located on a front side surface of the lower receiver. 
     
     
         5 . The lower receiver of  claim 4 , wherein the plurality of finger recesses comprises four finger recesses. 
     
     
         6 . The lower receiver of  claim 1 , further comprising a plurality of finger recesses located on a side surface of the first receiver portion. 
     
     
         7 . The lower receiver of  claim 1 , further comprising a plurality of finger recesses located on a side surface of the second receiver portion. 
     
     
         8 . The lower receiver of  claim 1 , further comprising a first opening along a top side surface of the lower receiver and a first hole extending from a left side surface to a right side surface of the lower receiver, wherein the first opening is configured to receive a trigger assembly, and wherein the first hole is configured to receive a trigger pin to secure the trigger assembly within the first opening of the lower receiver. 
     
     
         9 . The lower receiver of  claim 1 , further comprising an integrated trigger guard, wherein the first receiver portion comprises a first portion of the integrated trigger guard, and wherein the second receiver portion comprises a second portion of the integrated trigger guard. 
     
     
         10 . A modular firearm comprising:
 a lower receiver comprising:   a first receiver portion; and   a second receiver portion configured to mate with the first receiver portion along a mating surface, wherein an inner surface of the first receiver portion and an inner surface of the second receiver portion define a magazine cavity configured to receive a magazine.   
     
     
         11 . The modular firearm of  claim 10 , wherein the mating surface is located along a vertical plane that bisects the lower receiver from a front side surface to a rear side surface. 
     
     
         12 . The modular firearm of  claim 10 , wherein the magazine cavity comprises a magazine opening along a bottom side surface of the lower receiver, and wherein the magazine opening is defined by a surface that slopes downward toward a front side surface of the lower receiver. 
     
     
         13 . The modular firearm of  claim 10 , further comprising a plurality of finger recesses located on a front side surface of the lower receiver. 
     
     
         14 . The modular firearm of  claim 10 , wherein the plurality of finger recesses comprises four finger recesses. 
     
     
         15 . The modular firearm of  claim 10 , further comprising a plurality of finger recesses located on a side surface of the first receiver portion. 
     
     
         16 . The modular firearm of  claim 10 , further comprising a plurality of finger recesses located on a side surface of the second receiver portion. 
     
     
         17 . The modular firearm of  claim 10 , further comprising a first opening along a top side surface of the lower receiver and a first hole extending from a left side surface to a right side surface of the lower receiver, wherein the first opening is configured to receive a trigger assembly, and wherein the first hole is configured to receive a trigger pin to secure the trigger assembly within the first opening of the lower receiver. 
     
     
         18 . The modular firearm of  claim 10 , further comprising an integrated trigger guard, wherein the first receiver portion comprises a first portion of the integrated trigger guard, and wherein the second receiver portion comprises a second portion of the integrated trigger guard. 
     
     
         19 . A left side portion of a lower receiver for a modular firearm, wherein the left side portion is configured to mate with a right side portion to form a lower receiver for a modular firearm. 
     
     
         20 . (canceled)