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:

1. Use standard castle nut wrench & torque wrench.  They recommend Real Avid's castle nut tool along with a torque wrench.
2. 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.
3. Hand tighten barrel nut/handguard screws using 1/8" hex drive. Then torque screws to 30-35 inch/lbs