Sig Sauer MCX Rattler 5.56 NATO 5.5" M-LOK Upper Receiver UAMCX-5B-556-BLK-TAP

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. Sig Sauer MCX Rattler 5.56 NATO 5.5" M-LOK Upper Receiver UAMCX-5B-556-BLK-TAP