Self-lubricating, polycarbonate follower with precision-wound, heat-treated, chrome silicon spring ensures reliable feeding you can count on for defensive maneuvers and tactical competitions. Removable base plate allows easy disassembly for cleaning. RugerA(R) Mini-14A(R) magazines have a heat-treated, carbon steel body that's TIG welded for uniformity and lasting strength. Available in .223/5.56mm (20- and 30-round). Mfg: Pro Mag