I mounted a Leupold Mark AR in one of these mounts a couple of months ago and am so far very impressed. While shooting groups at 50, 100 and 200 yards I removed and reinstalled the mount several times and I could not discern any POI change at all. As soon as I acquire a different BUIS I plan to do a lot more of this type of testing (my YHM sight doesn't fit under the scope). The mount fits in the rail slots without any play, and the design of the throw levers ensures consistent torque every time; so it should remain rock solid and accurate.