I went with the CZ's due to the locking "tab" which corresposds with the notch in the receiver. I figured they put this locking recess on the .416 for a reason, so I used their rings. Very well built rings, quite heavily built, probably heavier than necessary. My Rigby shoots phenomenally well for a box stocker. Under 1" at 100 yds. Great gun for the money. A little pricey to feed, but hey, I didn't buy it for an inexpensive plinker. I think you'll like yours.