Give us a reason to use anything other than the pp bizon until we get the amp 9.
The mp5 and pp19 vityaz are both completely useless unlocks right now.
Since your weapons team seems to be having difficulties balancing and understanding the SMG class, which has a whopping roster of five guns, I'll do your work for you:
The MP5 should be easy to use, very controllable, middle of the pack range and mid bullet velocity, it's supposed to be an easy to use, versatile gun. This is the exact opposite of what has been done in the S2 patch, which gave this already shitty gun an uncontrollable horizontal recoil nerf. Why??
PP19 Vityaz: heaviest smg, higher recoil, more damage and longer range, faster bullet velocity. It's a hard hitting gun with focus on stopping power and range.
Amp9: light, fast and aggressive. Low range and bullet velocity, melts up close but falls off past 50 meters. Leave the recoil as it is.
Leave the vector as it is, since it has taken a pretty hard hit to range, arguably overnerfed but ok.
This would make us actually do different loadouts and have a reason to use every smg