Knight’s Armament URX 4 Rail, M-LOK 13″


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KAC PN 32304-1300

The same handguard as found on the SR-15 14.5″ MOD 2

(5 customer reviews)

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Knight’s Armament URX 4 Rail, M-LOK 13″

KAC PN 32304-1300

The KAC URX 4 Forend 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.

Each URX 4 Rail comes complete with an installation wrench, shim kit and instructions

Weight: 12.7oz
Length: 13″
Inside Dia: 1.55″
Outside Dia: 1.68″ (side to side)

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5 reviews for Knight’s Armament URX 4 Rail, M-LOK 13″

  1. brandonelliott610 (verified owner)

    Solid mlok rail took some work to pin my gas block using this rail. Couldn’t be happier with the final build though. Great company as well to purchase from. Even threw in dinner for me haha love that ramen.

  2. Louie (verified owner)

    One of the most versatile, lightweight, and toughest rails I’ve ever ran. It is quite the unit, Thanks Rooftop!

  3. Dave (verified owner)

    Great product, fast shipping, and a free dinner included. Very happy with my purchase.

  4. Hector (verified owner)

    KAC quality does not disappoint and neither does Rooftop defense!

  5. Joey Nicholson (verified owner)

    It’s from KAC! What could be bad? What really needs to be screamed out is the customer service and speed of Roof Top Defense! Very happy customer!

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