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"
|Shipping Restriction||ITAR/Export Restricted|
|Barrel Rest||Free Float|
|Finish||Type III Class 2 Hardcoat Anodized|