Any good air rifle will be very effective on squirrels. I killed plenty growing up with a plain pump Crosman and iron sights. Air rifles have come a loooong way in the 30 years since. I would have to think that my old bb guns would be considered crap today..
Maybe someone in the know can answer another question that this brings up. For what possible reason are people buying these four and five hundred dollar airguns?
You can buy a 10/22, put a $100 scope on and accessorize it for less than some of these new airguns cost. I just don't get it...