Look for a dedicated air rifle scope, if your air rifle is a break-barrel spring piston model. The piston slamming forward will kill most regular rifle scopes - especially budget models. Unless the lenses are secured against counter-recoil, they WILL come loose. Another consideration is how close the scope will focus; many go from 50 yards to infinity, which gives you a fuzzy image at 10 meters - typical air rifle shooting distance.
Air Rifle Scopes
Air Rifle Scopes