Garage genius Jörg Sprave, who invented the machete-firing crossbow, has made a multi-shot slingshot that repeats like a Gatling gun:
The Slingshot Channel took the challenge to design a rubber powered version of Mr. Gatling's great invention. And here it is: Eight 20 mm balls, on their way to the target in less than half a second. The theoretical firing rate is 960 rounds per minute, slightly faster than the popular M16 assault rifle.
via Geekosystem | Sprave's Blog