And it stacs. Still you need two or three runepriest with a Rune in a mastery they don't want to take to be efficient healers. All three need to be active.
And then you can push gunblast to one global cooldown.
That even stacks with expert skirmisher if your enemy is in 20 feet of you. But if you are under the Gcd you are under it. No need then to be 1.25 secs or 0.5 secs or 0.25 secs on flame bomb.
Of course this is great. But it is easier just to get another Engi instead of this tactic.

And we have lots of snipers and very few runis.
