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The KAC URX III & 3.1 Rail 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.   Available in 8"or 13.5" lengths.

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 (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.


Big Book Catalog, Issue:72, Page:060

SPECS: Fits - AR15/M16 rifles.  Free Float.  Material: Aluminum.  Finish: Black Anodizing.  8" Weight - 8.6 oz. 13.5 - Weight - 13.8oz.

KNIGHTS ARMAMENT - AR-15/M16 URX III & 3.1 FORENDS

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Backorder, See Associate
Out of Stock

Color: Black

Length: 8

Material: Aluminum

Style: Picatinny

Type: Free Float

Backorder, See Associate
Out of Stock

Color: Black

Length: 13.5

Material: Aluminum

Style: Picatinny

Type: Free Float

Discontinued by the Factory

Product has been discontinued and no longer available.