Ive use a set of older Weaver rimfire rings or a Williams 22/410 receiver sight for years on my various m24's. But if I didn't have them, I might consider a scope base listed on eBay as Savage Model 24 OU Shotgun Rimfire Perfect-Adapter™ Gun-Guides® that looks like it would allow a variety of scope and dot mounting options. I've never used or even seen these bases, but it might be worth looking into.
Bfly
These $32 "Perfect-Adapters" look like the B-Sqaure adapters and the $11 Chinese knock-offs that I cited earlier in this thread.
