"Gatling guns have been the first firearms with a firing rate close to modern machine guns. Their principle is easy: A set of rotating barrels is turned by cranking a wheel, with one barrel after the other firing a round when it is in shooting position. This makes them technically and legally a repeating gun, not a full auto one - but it is close enough."
Pretty cool aye, bet it could make you bleed.
it was invented by jorg sprave be sure to check out his blogspot: slingshotchannel.blogspot.com