BOLT CARRIER FOR SEMI-AUTOMATIC and AUTOMATIC FIREARM

Abstract

A firearm magazine and a corresponding bolt carrier assembly are provided herein. The firearm magazine includes a magazine body, with the magazine body having a width to accommodate a double stack of cartridges in a zigzag pattern. The firearm magazine also includes a spring coupled to a follower within the magazine body. The magazine body also includes two feed lips coupled to the magazine body, where the two feed lips together hold a single cartridge in place in a center of the magazine body to allow a bolt carrier to push the single cartridge out of the firearm magazine and into a chamber of a firearm. The bolt carrier includes feed lip channels configured to accommodate the feed lips therein. A cocking surface is located between the feed lip channels and has a width of less than 0.400 inches.

What is claimed is: 
     
         1 . A bolt carrier assembly, comprising:
 a body having an elongated cylindrical shape with a first end opposite a second end, the body having a central axis extending from the first end to the second end;   two feed lip grooves formed in a surface of the body adjacent to the first end, the feed lip grooves extend parallel to one another from the first end toward the second end; and   a cocking surface between the feed lip grooves, the cocking surface having a width of about 0.200 inches to about 0.380 inches.   
     
     
         2 . The bolt carrier assembly of  claim 1 , wherein the cocking surface is parallel to the feed lip grooves. 
     
     
         3 . The bolt carrier assembly of  claim 1 , wherein the body further comprises a stepped surface formed in the body. 
     
     
         4 . The bolt carrier assembly of  claim 3 , wherein the stepped surface is opposite and parallel to the cocking surface. 
     
     
         5 . The bolt carrier assembly of  claim 1 , wherein a width of the cocking surface is about 28% to about 38% of a width of the body. 
     
     
         6 . The bolt carrier assembly of  claim 1 , wherein the body further comprises a tapered portion adjacent to the cocking surface and the cocking surface is between the tapered portion and the first end of the body. 
     
     
         7 . The bolt carrier assembly of  claim 6 , wherein the cocking surface extends between the first end and the tapered portion. 
     
     
         8 . A bolt carrier assembly, comprising:
 a body having a first end opposite a second end, the body having a central axis extending therethrough, the central axis extending from the first end to the second end; and   a cocking surface formed in the body adjacent to the first end, a width of the cocking surface corresponding to a cartridge diameter, the width of the cocking surface less than 0.400 inches, the body configured to accommodate a double stack, single feed magazine.   
     
     
         9 . The bolt carrier assembly of  claim 8 , wherein the width of the cocking surface is about 28% to about 38% of a width of the body. 
     
     
         10 . The bolt carrier assembly of  claim 8 , wherein the width of the cocking surface is about 0.200 inches to about 0.380 inches. 
     
     
         11 . The bolt carrier assembly of  claim 8 , further comprising a stepped surface formed in the body opposite the feed lip grooves. 
     
     
         12 . The bolt carrier assembly of  claim 11 , wherein the stepped surface is opposite and parallel to the cocking surface. 
     
     
         13 . The bolt carrier assembly of  claim 12 , wherein the body further comprises a tapered portion adjacent to the cocking surface and opposite the first end of the body. 
     
     
         14 . The bolt carrier assembly of  claim 13 , wherein the cocking surface extends between the first end and the tapered portion. 
     
     
         15 . The bolt carrier assembly of  claim 13 , wherein the body further comprises two feed lip grooves formed in the body adjacent to the first end, the feed lip grooves are parallel to one another opposite the stepped surface, and the feed lip grooves extend from the first end to the tapered portion. 
     
     
         16 . A firearm assembly, comprising:
 a barrel having a barrel extension;   a plurality of bolt lug recesses formed in the barrel extension;   a double stack single feed magazine having two feed lips, wherein a bolt channel is formed between the two feed lips; and   a bolt carrier assembly comprising:
 a body having a first end and a second end, the body having a central axis extending from the first end to the second end; 
 one or more feed lip grooves formed in the body, the feed lip grooves configured to accommodate the feed lips therein; 
 a cocking surface formed in the body between the feed lip grooves, the cocking surface substantially parallel to the one or more feed lip grooves, the cocking surface having a width of about 0.200 inches to about 0.380 inches; and 
 a bolt disposed in the first end of the body. 
   
     
     
         17 . The firearm assembly of  claim 16 , wherein the bolt comprises a plurality of bolt lugs, each bolt lug of the plurality of bolt lugs corresponding to at least one bolt lug recess of the plurality of bolt lug recesses which correspond to the plurality of bolt lug recesses. 
     
     
         18 . The firearm assembly of  claim 16 , wherein a width of the bolt channel is about 80% to about 90% of a diameter of a cartridge in the double stack single feed magazine. 
     
     
         19 . The firearm assembly of  claim 16 , wherein the cocking surface of the body is configured to be positioned between the feed lips of the double stack single feed magazine. 
     
     
         20 . The firearm assembly of  claim 16 , wherein the bolt comprises a tapered portion and the cocking surface extends between the first end and the tapered portion.