Follow Up - Finally got my hands on one. Solid built piece. Has some adjustability in setting ring width which came in handy when mounting my USO SR6. The cam feature is incredibly nice and locks up nice on rail and seems to be non-marring. Company claims RTZ if placed at same place on rail - haven't tested this. Love that this is tool-less and there are no bolts or levers. As a bobro guy, I'm glad I took a leap of faith and went with KDG. I'll use going forward.