I have an old XB 30 with the speed ring. The speed ring gets down low, which is why I bought it because it is on an old Browning Fury, running about 230 fps. Anyway I have been having trouble sighting it in. Not getting good repeatability. That being said, I opened up the turrets to adjust, and not paying attention, I loosened the tops. See the picture. That was before I figured out that they were not the reticle adjustment. What are those for? I did figure out all I need to do is turn the ring.