15" Full Top Rail MLOK Handguard (Includes Barrel Nut & Hardware). Made of 6061-T6 aluminum and anodized black per mil-spec MIL-A-8625F, TYPE III, CLASS 2. Full top rail + MLOK slots on 7 other sides. Includes anti-rotation tabs. Hand guard weighs 10.0 ounces. Barrel nut and hardware weigh an additional 2.6 ounces. RSR -