On Ripley's Believe It or Not they were just showing a kind of illegal English shotgun. The gun had an eight foot long barrel, and according to the show it was actually not meant for use against humans, but rather was developed for duck hunting. It said if the gun was shot into a flock of ducks, it could kill as many as 500 at once. The show also said it takes a pound of gunpowder just to fire once. I am trying to find a picture of it right now, because it looks exactly like Rip's gun.