The spitfire buff was not necessary and probably not the greatest move.
The gun takes absolutely no skill to use, people are just running around with it spraying bullets in hip fire all over the place. I'd rather have the OP mastiff back in the game than this spitfire.
Numerous lobbies are filled with squads that have 2-3 spitfires, with a never ending spray of bullets being sent your way.
It's made snipers basically useless. Snipers used to be fairly effective in that range that was some place between long and mid range. Now you can't even use them there, try and peak to line up a shot? You'll get a never ending spray of bullets sent at you. From a gun that has next to no recoil and a magazine that's massive.
If the want to keep the buff, boost the recoil and substantially. Never ending bullet spray should have some expense..