Depends on how much you want to spend.
I have some really cheap 3-9x40mm laying around (like a box full of them) which has good clarity and eye relief. These scope doesn't even have a brand...You can try to find something like these...it's around 30-50 bucks. (we give it for free when people buy air guns or .22 rifles from us..)
or go for cheap brands that makes stuff in the mid ground for both air guns and small cal RS. For example, Sun Optics which i'm using now..A 4x fixed prism acog style RS optic they made....(got it cause it's a demo scope for 80 bucks at a gun show..which I did a research later to found it it's suppose to be almost $200 USD)
that's the cheap option, which has no warranty and no promises..
or you can go for the RS scopes like red field, leupold, vortex, burris, and bushnell which all should have no questions asked warranty service which is worth the extra bucks. (not sure on burris and bushnell) but usually these are 150 - 800 bucks..
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