Hello,
I tried installing a scope on my .223 Ultra using Burris Signature Zee rings (medium height). However, once I've tightened everything up, the mount still has a LOT of play (side to side as well as up and down). I can actually hold the gun pointing toward a light and see the lack of contact between the bottom of the rings and the Ultra mount. Do you have any suggestions as to what I can do? The rings just aren't clamping tightly enough to the base.