The light ammo Spitfire is too weak imo.
This is not a good LMG season. The L-Star and Spitfire are weak (though I'd still rather have a Spitfire), the Devo is constructed (and was never awesome, but you can at least learn how to use it with a huge curve), and the best one now, the Rampage, is a drop.
I get they wanted to nerf it but first, that was a mistake, mostly groaning from people who didn't really know how to fight it. And second, it was too hard a nerf, both switching to light and also removing a barrel mod. It should be returned to heavy, because the heavy category options for rapid fire close range are the Flatline and the Prowler, rather distinctly different than the Spitfire. The Hemlock can be used close, but is better mid-longish. Meanwhile you have the Alternator, R-99 and R-301...two of which I'd rather have than a Spitty (the Rs). You don't need the Spitfire competing with your light mags and stock upgraders in this category.
The problem to me is that when Respawn makes mistakes, they either don't fix them or fix them too late. Having seen the Spitfire enter this nerfed category, the best hope is to wait until a better LMG comes out, or the other options become finds instead of in construct or package drops. This category was pretty much obliterated this season.