Things I liked:The rings are top-notch....holding the scope secure. Things I would have changed:The base is good....bolts and nuts are poor!!! The treads STRIP too easy making it difficult to get the tightness needed for my RWS 52. This is my 3rd set to purchase from Pyramyd. All have been "carefully" hand tightened but on this set I have added LocTite. Calls to Leapers were useless.