Well, I tried them today. They work as described. The point of impact changed about .5MOA on one set groups but held right on zero on the 4 others. Held good groups. Still think I will take them off and sell somewhere. If someone is interested, let me know. I just don't have the need to take off and on. I feel better with a good set of Leupold bases and rings. These seem to push the scope up too high off the barrel for my taste. Alot cheaper too for the leupolds. It is handy being able to take off while cleaning.