Izhmash PP-19-01 Vityaz – ★★★★ Submachine Gun
Not to be confused with PP-19. Like all smoke grenade SMGs not named UMP45, she suffers from the fact that UMP45 exists. Basically a cross between UMP45 and UMP9, she uses the same smoke grenade stats and having slightly less evasion and slightly more HP she's about as good at tanking, but her buff tiles are awful compared to UMP45's.
In older times she was an alright choice back when there weren't as many SMGs, but these days you should have more choices and if you REALLY need a smoke, Ingram (especially now that you get a free one) can probably tide you over until you get UMP45.
Smoke grenades are usable at the OT position, but PP-19-01 doesn't even have the tiles for that. If you want a smoke grenade at your OT for any reason (decide WHY you want a smoke grenade there before making this decision), MAC-10(Ingram) is a better choice than her, assuming you don't have UMP45.