Yup. I lapped the following: 2 Leupolds, 2 Nightforces, 2 Trijicon Accu-Points. Does lapping make a difference? I don't know. I did not do a before and after test.
However, when I started to test the rings, the Wheeler lapping rods, were hitting only on about 25% of the Nightforce rings interior surface, tightened to 65 Inch pounds, on Nightforce bases, on Bolt action rifles, M70 Stealths, Weatherby Mark V, etc.
Lapping simply ensures more contact surface, or consistent contact, surface between the rings and the optic. And yes, I do place a drop or three or Loc-Tite between the optic and the rings. And yes, I epoxy the base to the receiver. Less movement, more consistency.
JMHO,
Geno