Patented double-stack design, for use exclusively with the Mossberg 590M Mag Fed pump-action shotgun. Features hardened steel feed lips, over-molded shell ramps, easy grip molded design, proprietary self-lubricating polymer magazine body material, removable floor plate for easy cleaning, and a tough black oxide finish on the steel components. Also available in 5, 10, and 20 round. For use with 2.75" shotshells only. 2.5"x3.5"x10.375"