I’m looking to get my son (age 42) an air rifle to use around his property to cull squirrels, possums, coons, stray cats, and other assorted vermin they frequent his chickens and turkeys. Was thinking 22 caliber pump or piston style. I don’t know much about them as my last air rifle was a Benjamin pump 22 and that was in the late sixties. Reckon thing have changed some since then, so I thought I’d ask the more knowledgeable people. Your thoughts?