AR-15 M-lok Handguard:

1. Ultra Slim Design For Comfort and Weight Reduction, Cool Both Your Handguard And Barrel.
2. Fully Dehorned and Deburred, All The Cutout Edges Are Beveled To Ensure The Safety For Handling.
3. The handguard slips over the barrel nut and is fastened by 6 screws. Two each at the, 3, 6, and 9 O’clock positions.
4. M-lok Slots & Full Picatinny Top Rails Hold All Your Accessories.
5. 45 Carbon Steel Barrel Nut Included.
6. High Quality 6061 Aluminum and Hard Coat Anodized.

• Type: AR15 Handguard.
• Rail: Picatinny Rail.
• Color: Black.
• Weight(including Barrel Nut): 280g(10").
• Outside Width: 1.50 " .
• Inside Width: 1.35 " .
• Length:10 inch
• Outside Height (Including top rail): 1.96 ".
• Material: 6061 Aluminum, 45 Carbon Steel (Barrel Nut).
• Barrel Nut Thread: American Thread 1 1/4-18 UNE.
• Fits: 223/556 series Upper Receiver with 1-1/4" 18 UNE thread.
• Pieces: 1.
• No. of Rails: 1.

Includes:

• 1 x AR15 Handguard
• 1 x 45 Carbon Steel Barrel Nut
• 1 x Roll Pin
• 6 x Barrel Nut Screw
• 1 x Allen Hex Wrench
• 4 x Shims 

Tips: Steel Barrel nut comes installed in the handguard, it will have to be removed to install handguard on the upper.
The barrel nut is tightened with a 1 1/16″ wrench, no specialized tools here.