This weapon is rediculous, so the stats should also be rediculous. I think this could be a good flank heavy weapon, with a tanky side as well.

+30% spin up speed and quieter firing sound (due to smaller barrel size)

+50% ammo count (300 bullets)

-50% bullets out per second initially (each barrel on its own shoots half the normal amount of bullets as stock minigun, doing only half damage)

[[[ +right clicking while holding fire button activates one barrel at a time (also each barrel needs to spin up on its own, not activating right away) ]]]

^This is the main ability of this gun, and all of the other stats revolve around said ability^

+total bullet output increases by 100% per active barrel (thereby increasing total damage per second)

-25% movement speed per active barrel

-ammo usage increased by 100% per active barrel

All 3 barrels revolve around each other once all 3 are active(Optional, just think it would look cool)

Also sound of firing is amplified by 100% per active barrel

I mentioned above that this weapon could have a tanky and flanky side, which doesn't make a would lot of sense but bear with me. Its flanky side is the higher spin up time and quieter firing with one barrel, with the 50% less damage still allowing heavy to mow down one or two people at a time with only one active barrel. The tanky side is obvious; the three barrels being active at once allows 50% more damage output than the stock minigun, making a cerberus heavy a good choice for an ubered push (but remeber he's also 75% slower than normal too). IF YOU HAVE A COMMENT MAKE SURE YOU UNDERSTAND WHAT I WROTE AND THINK BEFORE COMMENTING. Lots of complaints I get are just misunderstandings, so be sure to be insightful.