My brother owns a CZ 550 Full Stock in 7x57mm and he has the CZ rings holding a Burris Fullfield 4x12 scope. Duffy, my brother, has no problems at all with this rig. I believe CZ manufactures just one height of rings. I had a set on my CZ 550 American in 7x57mm, but I went with the Talley Rings and gave the CZs away to a forum buddy in Texas. Talley makes low, medium and high rings and come in either matt or polished. The CZ 550 receiver is machined for the rings and the whole system is solid as a tank. One of the fellows on a forum said he took a set of the CZ rings, which come only in the matt finish, and had them polished and blued and they came out looking like a set of custom rings. Hope this helps ... Tom Purdom :grin: