.223 Rem, 5.56x45mm, .300BLK ( Polymer body/hardened steel feed lip Compatible with modern weapon systems, including M4/M16/AR15, SCAR16, HK416, ARX160, SIG556, ARC, SIG MCX, IWI Tavor, IWI X95, SA80 Lancer set out to design a better 5.56 magazine; one with the reliability of steel and the durability and weight of polymer. The L5 Advanced Warfighter Magazine (AWM) is that magazine. The L5AWM's exclusive hybrid design includes a hardened steel feed lip assembly molded into a proprietary polymer body with aggressive surface texturing to create the ultimate rifle magazine tough enough for military, law enforcement, and competition applications.