Kac Urx 3.1 Forend Assy 556 13.5


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SKU: RSRKNAC30325 Categories: , Product ID: 1391134

Product Description for Kac Urx 3.1 Forend Assy 556 13.5

Knights Armament Co.s URX 3.1 13.5″ Rail Forend Assembly is a free floating, fully modular replacement forend for the AR-15 platform. Unlike traditional quad rail designs, the URX 3.1 incorporates short sections of M1913 Picatinny rail at its front and rear ends for mounting tactical accessories, eliminating the commonly unused sections of rail for reduced overall weight and a more comfortable grip. A total of 4 integral QD sling swivel sockets are provided for ambidextrous sling compatibility. This URX 3.1 rail is compatible with any standard gas system length but does require the use of a low profile gas block. Disassembly of the rifles 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 (PN: 20495″ Sold Separately). For AR-15/SR-15 based platforms only; not compatible with SR-25 variants. Installation instructions, barrel nut and hardware are included.

Features :

  • ,Free floating 13.5″ rail forend assembly,
  • Fully modular replacement forend for the AR-15 platform


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Additional Information for Kac Urx 3.1 Forend Assy 556 13.5

Weight 1.4400 lbs
Dimensions 14.5000 × 4.0000 × 4.0000 in

Upper Receiver Extending Rail Adapter System






URX 3.1