Spring piston air guns are scope killers, they don't have to be the magnum variety either. I just don't expect an inexpensive scope to last on a spring piston gun. It'll work for awhile, but at some point you're zero is going to shift and the groups will open up.
Would tend to agree with this..
Also, a proper air rifle scope will be set up to focus and be parallax free for say 25yards which is another benefit..