Ultimate Arms Gear AR Mag Cover Socs for 30-40rd Polymer & PMAG Mags, Punisher MERC Mercenary Made from High Grade Neoprene Rubber and Wrap Tightly Around your Mag. Improve Grip. In low light scenarios if you drop a mag, without looking, you will know which end goes in the rifle. Mag Not Included. Fits Polymer 30-40rd Mags including PMAG. USA MADE