An airgun can trash most scopes in a very short time, I got an R9 that came with a 4-16x Bushnell Banner or Trophy, it started jumping around and not adjusting correctly within 100 shots.
As rescue said, the anti walking pin, and rings that have double screws on each side.
I did a bunch of looking at what is used for airgun field competition to get an idea what holds up.
A sleeper great quality 6-20x is the Swift Premier Airgun scope that could be had online for about $225, that was a few years ago. They are super clear and hold up to airgun use, also the adjustments are repeatable and accurate and can be used for windage and trajectory changes as needed.
I can't speak for Swift's lower priced scopes, but their Premier line is very good in 6-24x and 8-32x and can be had in the $225 range online. I've had several for .17 HMR's and been very happy with them, and I'm an Elite 4200 type of guy.