big bore air rifles

A very American upstart industry - large caliber air rifles

Dennis Quackenbush, the guy who sort of created the industry:
http://www.quackenbushairguns.com/

Dan McVey
http://www.xp-airguns.com/

Jack Haley
http://www.southernairgunconversion.com

LeRoy Roduner
http://www.bgmfairguns.com/gargoyle.html

And you'll need ammo - Big ass hollow point bullets:

http://www.mrhollowpoint.com/