Ingenious design - the firerate goes down as the cylinder gradually empties, so there are fewer rounds to line up with the active barrel. This makes you conserve ammo when you're running low.
So let me get this straight- in order to fire the gatling gun, you pull back the bolt, cock the cylinder and pump on the rifle, then pull the trigger. I agree. Very credible.
I like that the bayonet and laser pointer are on the rotating part, too. Apparently that was my first impression because the rest of this seems pretty solid, really.
Whirrrrrrrr [Pink Floyd laser show and Powerpoint-y scope from the big honking knife in the way]