AR-15 13.5" Ultra Light M-LOK Handguard:

1. Ultra Slim And Enlarged Vented Design For Comfort And Weight Reduction, Cool Both Your Handguard And Barrel.
2. Smooth Machining, No Sharp Edges, All The Cutout Edges Are Beveled To Ensure The Safety For Handling.
3. 2 Sides of M-Lok Slots & Picatinny Top Rails Hold All Your Accessories.
4. 2 Integral QD Sling Sockets.
5. 45 Carbon Steel Barrel Nut Included.
6. 6 Barrel Nut Screw Holes for a Tight and Precise Fit.
7. High Quality 6061 Aluminum and Hard Coat Anodized.
8. Simple Installation

• Type: M-LOK Handguard.
• Rail: Partial Top Picatinny Rail.
• Features: Ultra Light.
• Net weight(including Barrel Nut): 9.38oz / 266g.
• Outside Width: 1.54".
  
• Inside Width: 1.36".
• Length: 13.5".
• Outside Height (Including top rail): 1.97".
• 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 Ultra Light Slim M-LOK Handguard
• 1 x 45 Carbon Steel Barrel Nut 
• 6 x Barrel Nut Screw
• 4 x Shims 

Tips: Steel Barrel nut comes installed in the handguard, it will have to be removed to install handguard on the upper.