The Knight's Armament Corp. Upper Receiver Extending (URX) Rail system is one of the most trusted tactical free floating rails on the market, given that KAC invented the railed fore-end in the early 90s.
Using a proprietary barrel nut, the URX II and III feature a slick design which requires specialized tools for installation, but yields one of the lowest profile rail profiles available.
This rail is the same rail featured on the SR-15 Mod 0, and is well suited for carbine length rifles with low profile gas tubes. It features a built in front sight which makes this one of the most low profile rail systems on the market.
Installation services available from Weapon Outfitters!