The slimline rails from Midwest Industries are perfect for maximum performance while reducing weight. These handguards come with everything you need for installation: Barrel Nut, Barrel Nut Wrench, Torque Plate, Picatinny rail, and Hex Keys. Feature: 4140 heat treated barrel nut Features patented 4140 heat treated torque plate MIL-STD 1913 Picatinny top rail Two integral anti-rotation QD sling sockets Super slim Three sides of M-Lok Fully dehorned and deburred 100% made in USA keeps America working MI lifetime warranty