KCI USA Rifle Magazine, 223 Remington/556NATO, 30 Rounds, Translucent Smoke, Fits AR-15, Polycarbonate Construction, Steel Reinforced Feed Lips KCI-MZ065 These standard capacity magazines are constructed from a proprietary polycarbonate formula" with a patented stainless steel internal feed lips" stainless steel extra powered spring and an anti-tilt follower. The transparent opaque design with dual round count markings allow for visible round count confirmation from any side. A textured outside surface ensures an intuitive grip for precise manipulations.