Lapping rings is not too common anymore with most rifle types. Lapping was sometimes necessary on guns that had drilled and tapped receivers. Due to machinery tolerances play in the fastener holes misalignment was a legitimate concern. Also rough machining of the interior of the rings and caps often left marks in scopes. Lapping helped bring down the high spots and gave the rings more contact with the scope.No one laps their scope rings anymore?
Granted, manufacturing tolerances have greatly improved over the years, but lapping the rings can only improve the accuracy of a given rifle scope.
Lapping a scope is a good idea for gun types and the conditions mentioned above. With quality rings and guns with fully dovetailed receivers lapping isn't really necessary. I have a lapping kit but I haven't used it in years for that reason.
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