4 inch M-LOK Handguard:

• Steel Barrel nut included.
  
• 2 shims included for easy indexing.
• Ultra Slim 1.48” Outside and 1.29” Inside Diameter.
• Simple Installation.
• M-Lok & Picatinny Rails Hold All Your Accessories.
• 4 Sides of M-Lok Slots Around The Body.
• Five Integral Anti-Rotation QD Sling Sockets.
• MIL-STD 1913 Picatinny Top rail.
• Rugged 6061 Aluminum Hard Coat Anodized.

Specification:

• Type: M-LOK Handguard
• Rail Type: Picatinny
• Material: 6061 Aluminum, Steel (Barrel Nut)
• Fits:223/556 series Upper Receiver with 1-1/4" 18UNEthread
• Rail Type: Picatinny Weaver
• Barrel Nut: External Diameter:1.35 inch, Inner Diameter:1.24 inch
• Barrel Nut Thread: American Thread 1 1/4-18UNE
• Pieces: 1
• No. of Rails: 1

Important Note:

1、Barrel nut should NOT be tightened on the gearwheel side. Please avoid applying any force to the gearwheel/teeth while tightening barrel nut, it may damage its teeth.
2、The distance from center of barrel nut to the top of handguard rail is 1.23". If this distance is the same as the rifle receiver, the handguard rail will be flush with rifle receiver top rail.

Tips: Bulk order can order without logo, or print your own logo on handguards.