Rob, I've found that many older Kimber rings have angled relief cuts in their female dovetails to clear the curved tops of the RF Kimber rifles made with the standard tipoff 3/8" dovetails. The male dovetail side-to-side dimensions are all much the same and it's easy to grind or file the clearance angles (hidden) inside the female dovetails on the rings.
Whenever these are sold on eBay, often the seller will specify that the rings either will or will not clear the curved-top receivers. It's immaterial to me since it's so simple to cut the necessary clearances and the cuts are totally hidden from the outside.
BTW these are unrelieved flat-bottom-dovetail rings, they work fine as-is on the Kimbers and Warne Premiers with the flat-top bases or my customs with ribs. For use on a smaller curved-top RF, they would need to have the clearance angles cut.
Regards, Joe
