Very nice quality, fits perfect. - SIG SAUER MCX/MPX Side-Folding M4 Style Stock Black - All NFA Rules Apply STKXFOLDM4BLK

I was afraid this Sig stock would be too bulky but fits my MPX perfectly and makes it a more comfortable gun to shoot. The closing latch is stiff and a little difficult to close but I’m hoping it will ease up with use. For me it’s an improvement over the skeletonized stock.