This design was developed to increase stabilization and provide a simpler solution that requires less specialized tools to install and maintain. The IBN system torques the rail onto the weapon and allows the rail to act as the barrel nut. Another key feature to the URX 4 is the Integrated Barrel Nut (IBN). This free-floating, continuous top rail is manufactured with the Keymod mounting system and is built stronger and more stable than previous designs due to the absence of a removable bottom rail. The latest addition to Knight’s family of URX Rail Systems is the URX 4. Here’s the full press release from the company: Knight's Armament became the second company, apart from Noveske Rifleworks to adopt this system for their new weapons systems.
But what makes the URX4 unique in the URX family is that it's the first upper receiver and rail product that incorporates the open-standard Keymod System that originated from VLTOR Weapons Systems. Just announced last 25 January 2013 is the URX4, the latest in the URX rail system from Knight's Armament Company (KAC).
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