Brownells sells a kit that contains items for lapping rings. i think midway sells one to. i have been thinking about buying one . i dont do it now but i understand it can help insure good contact with scope and rings. i knew a guy that did go to all this trouble , he passed away not long ago ,and his widow sold some of his guns. i removed some of the scopes (most were luepold v III ) and you couldnt even tell they had been mounted. so i am assuming it works.