KAC Knights Armament URX 4 5.56 M-LOK Forend Rail Kit – 10.75″


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SKU: 32304-1075 UPC: 819064016007

Product Description

Knights Armament Co.’s URX 4 10.75″ M-LOK Forend Assembly Kit is a fully modular design that utilizes the revolutionary M-LOK accessory mounting system. The URX 4 Rail is stronger and more stable than previous URX designs due to its one-piece construction. It is also lighter due to its Integral Barrel Nut (IBN) system of attachment. The IBN system allows the rail itself to act as the barrel nut when torqued onto the rifle completely eliminating the need for a separate steel barrel nut. M-LOK accessories may be mounted anywhere along the URX 4’s length making it one of the most user-configurable designs on the market.

  • Length: 10.75″
  • Includes shim set and wrench
  • Inside diameter: 1.55″
  • Outside diameter: 1.68″ (side to side)




Technical Information

Color / Pattern
Caliber 5.56 NATO / .223 Remington
Firearm Compatibility
Mounting Platform

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit www.P65Warnings.ca.gov

Customer Reviews

Based on 1 review
Joshua S.
12.5 wet dream

Replace for a Geiselle rail on my 12.5. Couldn’t be happier. An inch and a half makes a difference ;)