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Mfg Item #: UAMCX5B556BLKTAP
Upper Receiver for the Sig Sauer MCX Rattler. Features a 5.5 inch barrel and a polymer handgaurd with MLOK attachment points, and a full length picatinny rail for the installation of sights, optics and other accessories. Additionally, the this upper comes with a receiver stock adapter kit, side folding AR buffer tube knuckler, and match duo trigger kit. This will work on a standard AR Pistol lower