As we have seen in the latest RO:HOS videos the sovjet hero weapon is the AVT 40 but why not chose the AVS 36 instead? It has a 15 round magazine instead of the AVT 40's 10 round capacity and while 15 rounds are not much compared to the MkB 42's 30 it is still more than the measely 10 round the AVT 40 carry. Granted the AVS 36 probably wasn't used at that point in the war and I don't know if there where any used at Stalingrad but really a full automatic weapon with only 10 round capacity is really not worth the while to use even if it gives 'street cred'