This video is a little OTT, but awesome none the less. Here's the link to it...
http://www.big-boys.com/articles/iraqfootage.html
For all you FJ types, next time you do FE with a Chinook and he calls "Snapshot," now you know what could be coming at you!
On the highest settings that equals 4000 rounds per min (or 66.6 rounds a second).
Enjoy...
PP