The 452 American has a 3/8" dovetail with which many rings will work. Some are relatively inexpensive, like the UTG Accushot two piece rings, available at Amazon for about $20. I have those on my 452 American (for a 30mm tube). They hold very well. The BKL rings are very good, but in Canada they are not inexpensive despite the previous poster's assertion. I have at least half a dozen of them. The Warne 7.3/22 rings were once available for about $35 at Amazon but I think they've gone up in price. They have a base rail clamp that can be flipped to accommodate 3/8" or 11mm and they are solid. I have them on a CIL Anschutz. Burris, Leopold, and Talley rings are also good.