Patent ID: 8776419

Claim:
A magazine for a firearm comprising: a tubular body having surfaces defining an elongated passage and having a lower end and an upper end having feed lips; a floor plate element connected to the lower end; an elongated separator element within the passage spaced apart from the body surfaces; a follower defining an aperture receiving and surrounding the separator element and movable within the elongated passage; the follower movable within the passage from a lowest position to a highest position, wherein at least a portion of the follower is within no more than one cartridge diameter from the feed lips when in the highest position; the separator element extending from the lower end of the body to a level proximate to the upper end; the aperture of the follower receiving an upper end portion of the separator when the follower is in the highest position; and a spring within the passage having a first end contacting the floor plate, and having an opposed second end contacting and biasing the follower toward the upper end of the body; and wherein the body has a rear wail, and wherein the rear wall includes a medial rib extending forward, such that the rib defines a separation between a stack of cartridges right of the rib, and a stack of cartridges left of the rib.