Forged 7075-T6 Aluminum, Hard Coat Type III Anodized Black, Specialized Tension Screw - Eliminates Upper/Lower Play, FRANKLIN ARMORY Binary Firing System Trigger, A2 Pistol Grip, Magazine Manufactured from Stainless Steel, Marlube Finished, 30 Round 5.56 NATO Capacity, 10/20 or 10/30 Magazine for Restricted States, Anti-Tilt Follower, Stock M4 Design, Reinforced Six Position Collapsible, Multiple Rear Sling Mounts, Angled Heel for Easier Transition, Aluminum Carbine Length Receiver Extension