KAC - Knight's Armament Company URX 4 Series Rail Handguards - M-LOK, IBN


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KAC - Knight's Armament 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"


Manufacturer Knights Armament Company
Shipping Restriction ITAR/Export Restricted
MSRP $271.66
Weapon Model N/A
Barrel Rest Free Float
Material No
Material Finish No
Color Black


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