The p90 is weak needs minor adjustment
The P90 (I don't care what the games made-up name for it is) has extremely mediocre stats compared to some of the other smgs, so simple solution to give it a small boost that makes it shine in its own way and stand out. The P90 shoots 5.7mm, so its muzzle velocity should be slightly increased to match the real life velocity and its damage falloff should be increased a bit, maybe 5 meters for each step. I find myself having to 7 shot enemies to kill them at only like 20 meters away, and on top of that the gun has extreme horizontal recoil for an smg making it annoying to get a kill past 10 meters. So all that needs to be done is just to tweak that velocity and grant it better damage falloff stats which feels justified by it shooting a low drag, high velocity pistol cartridge.