- AR15 Free Float Picatinny Quad Rail - fits AR15 with Carbine Length DI Gas System - One piece design mounts to included Barrel Nut and Free Floats over the barrel, accessories mounted onto FF Quad Rail will not affect rifle's Zero. - Black Anodized Aluminum Construction - White T-Markings on the Quad Rails - Requires Low Profile Gas Block and the replacement of the GI Barrel nut and Delta Ring with the supplied Barrel Nut - Quad Rails compatible with Weaver/ Picatinny type Rail Mounts and Accessories - Continuous Top Rail feature will match up with Upper Receiver Rail - Length: 7.25" - Weight: 11.5 oz. - Inner Quad Rail Diameter: 1.75" Mfg No: MARFF4RS Manufacturer: NcStar
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