I am fairly sure that the x4 multiplier is across the board, but I was not exhaustive in looking it up.
It's worth noting that mgs deal a lot more damage when they aren't applying suppression. Accuracy and rof becomes the mitigating factor then. So the mg that gets itself pinned first I think gets a net dps boost. But that is entirely theory and untested.
@Vuther I'm pretty certain it replaces the modifier. But again, I haven't tested that.
