I have 2 sets of Optilock rings and bases and as previously mentioned work very well to protect the scope from any marks. The only thing I don’t like about these rings is that they set the scope fairly high. The extra low rings can still have clearance for the 50 mm Obj. lens. Another thing that some members don’t like is that the screws on the base are made of a soft material but I haven’t had any problems with mine...