There are a bunch of Soviet weapons that are not in the game that I think could be added, they are as follows
PPS 42/43
PPD 34/38
DS-39
SG-43 Goryunov
DShK 1938
Pm m1910 Maxim machine gun
Maxim–Tokarev
Fedorov Avtomat
ROKS-3 flamethrower
RPG-40 anti-tank grenade
RPG-43 anti-tank grenade
The Dyakonov system rifle grenade launcher
RM-38 mortor
82-BM-37 mortor