Rimfirehunter,
These Kwik-Site rings are a bit unusual as each unit is composed of three pieces. Top of ring is one piece, left bottom ring portion also has the left side of dovetail clamp and the right bottom ring also has the right side dovetail clamp. It's been a while but i seem to remember that they were a bit difficult to assemble onto the gun, but not impossible.
I had used these on an Anschütz Exemplar pistol, mainly to get the scope a bit higher. This was before the use of the high rise mounts seen in handgun silhouette. I only used them briefly but don't remember them moving at all.