I have never lapped any of my rings. After about 100 rifles I have only used any rings or bases beside the Weaver style 3 or 4 times and never had a reason to lap them. I hate those twist in style rings. Pain in the But. JMO. The only scope that ever moved on me was on a Contender handgun in 35 Remington. On that one I forgot to tighten them after turning the scope a tad at the range.