If you have the weaver/11mm combo rail, just go with some weaver style rings.

If you just have the dovetail grooves, you might try something like this:

https://www.airgundepot.com/rws-lock-down-scope-mount-1-inch.html

I used one of those bases on a RWS 3500 (22 cal magnum springer) and it held solid. it has the locking pins and 25 moa forward cant to alleviate potential barrel droop.

[Linked Image from i.imgur.com]