Sightron SIII 8-32X56 Scope finally came in after touring every UPS facility in the country. Need some good 30mm rings. Will be going to the city tomorrow, via Shawnee, who's has some in stock? Let me know this evening if you have any ideas. I used a good suggestion for measuring the height for clearance by using pennies. Ha. 21mm or about .82" keeps the bell off the barrel with sunscreen.