It's been a while since I've worked on this one, but it goes on forever and there's a point where you can't win.The gun was anti air and it's an equip, not a turret. You can use it on the ground guys, but it's not worth. Only for air.
It's interesting that after all this time you still remember. that gun must be ultrakill on those flying one
If I recall, it's the only way to actually kill them. lol