[youtube]http://www.youtube.com/watch?v=3vGobePvnTQ[/youtube]
You have to delete the 's' in 'https' youtube links to make them work.
That, and I'm pretty sure that was an airsoft gun; note that the guy was not wearing any hearing protection, there was no muzzle flash, no visible feeding device, no casing ejection, and there was a pneumatic hose attached to the gun on the lower right side. I'm not even certain that you could feed rimfire ammo into a gun at that speed, you couldn't belt it up, and I'd be concerned about premature detonations with the feed mechanism on a powered gatling.
_________________
“The totally convinced and the totally stupid have too much in common for the resemblance to be accidental.”
-- Robert Anton Wilson