Originally Posted By: WobblyElvis
A regular .22 cal rim fire rifle is what you need. Use CB ammunition. Extremely quiet, accurate and far more hitting power than a pellet gun. About 700 ft.sec so it won't go far.
That CB ammunition has less power than many air guns on the market today. Plus it is still a firearm since it fires via explosion, which makes it illegal to fire in many neighborhoods/cities. Airguns are still legal in most jurisdictions.
I'd go with one of the Gamo whisper guns myself. Good quality at a decent price.