I have switched from Leupold & Redfield to the Burris Posi-Align rings. These will eliminate the need to lap your scope rings. Also, the synthetic inserts will not mar the tube of your scope. I did this because the last two pair of Leupold's that I bought fit poorly and it took a good bit of elbow grease to lap them to fit. I will say this is probably a fluke event and that most of the Leupold's I bought worked fine without lapping. Just my 2 cents worth.