Patented double-stack design for use exclusively with the Mossberg 590M Mag Fed pump-action shotgun. Features hardened steel feed lips over-molded shell 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 15 round. For use with 2.75” shotshells only. 2.5”x3.5”x12.625”