Patent ID: 8615917

Claim:
A cover for a firearm lower receiver, said cover comprising: an elongated member with front and rear ends, two side surfaces and upper and lower surfaces; on said lower surface near said front and rear ends, two engagement members project away from said lower surface and are configured to align with assembly pin holes of the firearm lower receiver to facilitate securement of the cover to the firearm lower receiver; a cavity formed in said lower surface between said two engagement members, said cavity also having an elongated shape and including a cavity upper surface parallel with the upper and lower surfaces of said elongated member; wherein said cavity has an extrusion portion near the front end and a channel portion near said rear end; wherein a width of said cavity between said two side surfaces is greater within the extrusion portion and lesser in the channel portion; a first extrusion in said extrusion portion of said cavity projecting from said cavity upper surface toward the lower surface of said elongated member and configured to engage an ammunition magazine installed in said firearm lower receiver; a circular extension at said rear end protruding upward from said upper surface and having a distal surface configured to engage a lower receiver stock bracket buttress of a firearm to protect internal edges of said stock bracket buttress.