it doesn't have any recoil the spinning barrels bring the recoil to 0, plus you would need to carry more that 3000 rounds and something like 3 car batteries to power it and in the end that's just to much weight to carry but cool creation though, good job!
The design of the barrel and the ammunition cylinder is fine, but I feel that the "body" of the gun is large and bulky. A personal M134 is hilarious, the recoil from the 7.62mm's could probably be used as a jetpack.
Awesome! but it's not gatlin gun, it's gatling gun. Did you know (and yes i happen to be a nerd) that they used vulcans in the age of the samurai? a gunsman would turn a handle on the side of the gun, rotating the barrel, and it shot, fast. god i need to stop watching the history channell :(