A Dennis Priddy airgun

http://www.longrifle.ws/forsale/?categoryID=all&age=Contemporary

Down the page a bit.

Back when I had time to scr...unh...research the Net a lot, there were some really interesting folks building modern bigbore, highpower airguns. Some were traditional, as is this one, and some were sci-fi Mad Max style -- that is, the builders and the products, in either case.

In any event, bet you'll be the only one on y'r block with one of these behind the back door.

Relax; we're all experts here.