Knights Armament Company URX 4 Series Rail Handguards - M-LOK - IBN

Out of stock
Knights Armament Company Company URX 4 Series Rail Handguards - M-LOK - IBN

The Knight's Armament Upper Receiver Extending Rail system, or URX, is now in it's 4th generation and being offered in M-LOK.  The URX 4 is a continuous top-rail system that utilizes Magpul's M-LOK mounting system. 

This rail system is built stronger and more stable compared to previous designs, and the modular design, with M-LOK slots on 7 sides of the rail.  Knight's unique Intergal Barrel Nut (IBN) moutning configuration is a modular and servicable mounting system that optimizes the rail system's strength and stiffness.  The rail itself acts as a barrel nut on the IBN system, a simpler solution than previous iterations that requires less specialized tools to install and maintain.


Available in the following lengths (and associated weights): 
  • 8.5" (8.3 oz)
  • 10.0" (9.3 oz)
  • 10.75" (TBD)
  • 13.0" (11.3 oz)
  • 14.5" (12.3 oz)
  • Inner Diameter:  1.53"
  • Outer Diameter:  1.69"
  • Rail Height:  2.07"
More Information
Dangerous GoodsYes
Shipping RestrictionITAR/Export Restricted
Barrel RestFree Float
FinishType III Class 2 Hardcoat Anodized
Material6061-T6 Aluminum
Mounting InterfaceM-LOK
Weapon ModelAR-15/M-16
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