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; 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