Sharps Bros AR-15 Full Top Rail M-LOK Handguard

Features: Full Top Rail MLOK Handguard (Includes Barrel Nut & Hardware). Handguard is made of 6061-T6 aluminum and anodized black per mil-spec MIL-A-8625F, TYPE III, CLASS 2. The barrel nut is 4140 PH steel. Full top rail + MLOK slots on 7 other sides. Includes anti-rotation tabs. 7" Handguard weighs ~6 ounces. Barrel nut and hardware weigh an additional 2.6 ounces. 10" Handguard weighs ~7 ounces. Barrel nut and hardware weigh an additional 2.6 ounces. 14" Handguard weighs ~9 ounces. Barrel nut and hardware weigh an additional 2.6 ounces. 15" Handguard weighs ~10.0 ounces. Barrel nut and hardware weigh an additional 2.6 ounces. Installation: Use standard castle nut wrench & torque wrench. They recommend Real Avid's castle nut tool along with a torque wrench. Torque barrel nut to 40-55 lbs. This is typically done 2-3 times, e.g. torque to 40-55lbs, then loosen, then torque again to 40-55lbs, then loosen, then torque to 40-55lbs one final time. Hand tighten barrel nut/handguard screws us