The Knight's Armament URX (Upper Receiver Extending) 3.1 rail is a free floating, hybrid modular replacement forend for your AR-15 rifle. The rail features a continuous upper picatinny rail and short sections at its front for accessories. The forend eliminates rail sections in the center for a lighter platform and more comfortable grip.
Four (4) integral QD swivel sockets are incorporated into the design for ambidextrous sling attachment points. The rail is made from high quality aluminum and features a durable anodized black finish.
This URX 3.1 rail requires a low profile gas block. Disassembly of the rifle's gas system and removal of the factory barrel nut will be necessary. This forend uses a proprietary barrel nut that MUST be installed using a KAC URX Barrel Nut Wrench (sold separately).
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