Based on our RS-C chassis, retaining all the desired features, but double the weight at 6 pounds. This this version features electrifying blue anodization, and packs extra weight for competition shooters. Comes with a pair of MLOK weights with QD sling sockets.  Also features a solid steel buttock extension tube to offset the weight of a heavy barrel or fore end weights. Will accommodate barrels up to 1.15" diameter without MLok interference, or even straight taper barrels (but may require shaving/grinding of MLok nuts and/or screw to fit without barrel contact)