Ultra-Rigid Design Made to Minimize Handguard Flex, Made to reduce point of impact shift with popular lasers such as ATPIAL, DBAL, NGAL, 4140 Steel Heat Treated Barrel Nut 2.250 Long, Barrel Nut and Wrench Included, Features Patented 4140 Heat Treated Torque Plate, 13.50" Top rail length, 11.4 oz Installed Weight, 6061 Aluminum Type III Hard Coat Anodized, Continuous MIL-STD 1913 Picatinny Top rail, Two Integral Anti-Rotation QD Sling Sockets, Super Slim 1.5 Outside and 1.250 Inside Diameter, Seven Sides of M-LOK, 5-Slot Polymer M-LOK rail included