Surefire Shoulder Ring for SCAR 17/ 20

I was really disappointed. I thought I would receive a custom part machined by PMM. This is just the shim kit and spacer that comes with the Warcomp and other Surefire muzzle devices. I was looking for something beefier, as the stock parts did not work for me. This went straight into my junk drawer; did not even open the package. Looks like I need to get on my lathe and machine my own part.