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Knight's Armament Co URX 3.1 Free Float Rail System for M4 / M16 Series Airsoft AEG Rifles (Color: Black / 10.75")

ID: 46913 (RIS-KAA-URX31-11)
4.0 stars, based on 1 reviews
Knight's Armament Co URX 3.1 Free Float Rail System for M4 / M16 Series Airsoft AEG Rifles (Color: Black / 10.75)
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MadbullKnight's Armament Airsoft


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  • Fully licensed by Knight's Armament Company
  • Made from CNC milled aluminum
  • Matte black anodized finish
  • 20mm Picatinny rails
Length: 10.75"
Compatibility: For Tokyo Marui, Matrix, G&P and other compatible M4 / M16 Series Airsoft AEG Rifles
Material: CNC Milled Aluminum

Manufacturer: Knight's Armament Co. (OEM Action Army, Licensed through ZShot)

About Madbull

MAD BULL Airsoft, established in 2004, is world famous for it's Airsoft accessories. Our major focus points are: Airsoft guns, Airsoft Toy Launchers, Airsoft Toy B.B. Showers, and Upgrade kits.We have a very strong R&D team and we put a lot of effort in designing new and exciting new products for the airsoft community.

1 Customer Review

(Write a review)

by ethan c. on 07/26/2014
"I got this rail system for my ICS Olympic Arms M4 and it is amazing. One thing I noticed is that it actually fit an ICS which is odd where I would have had to re-thread the upper to accommodate for an RIS. So just as a heads up, if you do wind up purchasing this, the threads are different from other RIS systems. That aside, the rail system is amazing because it has the ability to add rails where you want them instead of having to buy rail covers for comfort. This also helps reduce the weight, a lot, the rail is extremely light and I can barley notice it on the front. Just add some blue loctite to the threads of your gun and you are good to go

-Extremely light
-Affordable (compared to it's real steal counter part)
-Easy to install
-Fits ICS!!!
-Full metal

-Does not come with tool to lock down the barrel nut (I just used a flat head screw driver and a hammer to tighten it down)
-Does not come with extra rails or the rail segments that came with my real steal one for added comfort
-Fits ICS (this could be a good or a bad thing)

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