I purchased an air rifle Gamo Swarm Magnum and it comes with a scope. I want to upgrade the scope. Went to a national outdoor store, Cabela's and was told I have to have an air rifle scope because my air rifle would tear up an expensive scope. He then showed me a Cabela's air rifle scope 4x32. less than $100. I want a Leupold 3x9x40. Is this scope incompatible?