Sig Sauer Mcx Rattler 5.56 5 " Upper Assembly
manufacturer: sig sauer
Converts any MIL-SPEC AR Lower into a MCX Rattler. Complete with upper assembly, lower receiver stock adapter kit, side folding AR buffer tube knuckler, and match duo trigger kit. Comes with Sig Match Duo Two-Stage trigger and AR Buffer Tube Side Folding Adapter. Or you can run this without the buffer tube!