Thanks - I plan on waiting till the new scope gets here so I cam measure the height. I emailed Talley and they suggested the extended ring. I did not think I would need it. I will wait till I know exactly what I need, since I probably won't need the gun till next fall. I have selected a Bushnell 6-18X50 to replace the Simmons 3-9X50 it wears now. The gun is primarily for coyotes but the range is only 50 - 100 yards since I have a pond I shoot over. I hope to hunt a friends farm and may get some longer shots.