Firearm receiver with integrated mounting plate

Abstract

A firearm lower receiver defines a magazine well, a fire control well, and a trigger guard, where the lower receiver is configured to mate with and attach to an upper receiver. A bottom portion of the lower receiver defines sloped engagement surfaces extending along opposite lateral sides of receiver. In one example, the sloped engagement surfaces are between the trigger guard and the magazine well. In another example, the sloped engagement surfaces are part of a plate that forms the bottom wall of the trigger guard. The sloped engagement surfaces are configured for use with a corresponding clamp or quick-release mounting system.

1 . A firearm receiver comprising:
 a lower receiver defining a magazine well, a fire control well, and a trigger guard, the lower receiver configured to mate with and attach to an upper receiver;   wherein a bottom portion of the lower receiver defines engagement surfaces that protrude laterally outward and extend forward of the trigger guard.   
     
     
         2 . The firearm receiver of  claim 1 , wherein each of the engagement surfaces has a length of at least one-half inch along opposite lateral sides of the bottom portion of the lower receiver. 
     
     
         3 . The firearm receiver of  claim 2 , wherein each of the engagement surfaces is between the trigger guard and the magazine well. 
     
     
         4 . The firearm receiver of  claim 1 , wherein each of the engagement surfaces is sloped downward. 
     
     
         5 . The firearm receiver of  claim 4 , wherein each of the engagement surfaces slopes downward at an angle from 40°-50° with respect to a median plane of the lower receiver. 
     
     
         6 . The firearm receiver of  claim 1 , wherein the bottom portion has a lateral dimension of 1.5 inches as measured at lateral extents of the engagement surfaces. 
     
     
         7 . The firearm receiver of  claim 1 , wherein each of the engagement surfaces is inclined at an angle from 4-10 degrees with respect to a top surface of the fire control well. 
     
     
         8 . The firearm receiver of  claim 1 , wherein a lower margin of each of the engagement surfaces is parallel to a top surface of the fire control well. 
     
     
         9 . The firearm receiver of  claim 1 , wherein each engagement surface extends to an upper margin that is at least 0.19 inches above the bottom surface of the bottom portion. 
     
     
         10 . The firearm receiver of  claim 9 , wherein an outer margin of each of the engagement surfaces is spaced above a bottom surface of the bottom portion of the lower receiver. 
     
     
         11 . A firearm receiver comprising:
 a lower receiver defining a magazine well, a trigger well, and a trigger guard positioned below the trigger well, the lower receiver configured to mate with and attach to an upper receiver;   wherein the trigger guard has a bottom wall that defines sloped engagement surfaces along opposite lateral sides of the bottom wall, the bottom wall having a lateral width of 1.5 inches as measured at respective lower margins of the sloped engagement surfaces.   
     
     
         12 . The firearm receiver of  claim 11 , wherein the sloped engagement surfaces each have a length of at least one-half inch along the trigger guard. 
     
     
         13 . The firearm receiver of  claim 11 , wherein each of the sloped engagement surfaces defines an angle from 40°-50° with respect to a bottom surface of the trigger guard. 
     
     
         14 . The firearm receiver of  claim 13 , wherein the angle is from 44 to 46°. 
     
     
         15 . The firearm receiver of  claim 11 , wherein an outer margin of each of the sloped engagement surfaces is spaced from a bottom surface of the trigger guard. 
     
     
         16 . The firearm receiver of  claim 11 , wherein an outer margin of each of the sloped engagement surfaces is coincident with the bottom surface of the trigger guard. 
     
     
         17 . The firearm receiver of  claim 11 , wherein the bottom surface of the trigger guard is inclined at an angle from 4-10° with respect to a top surface of the fire control well. 
     
     
         18 . The firearm receiver of  claim 11 , wherein the bottom surface of the trigger guard is parallel to a top surface of the fire control well. 
     
     
         19 . The firearm receiver of  claim 11 , wherein the lower receiver is compatible with an upper receiver of an AR-15-type rifle. 
     
     
         20 . A firearm comprising the firearm receiver of  claim 1 .