I can work with that, makes sense. But being able to retreat does distinguish it from the zis and m42. Within my suggestion a 5th man is a nice survivability buff, so what would you think about removing retreat (including the other changes too)?
Why does SU always tries to get a hand on raketens? Because it can fall back, same goes for the outperforming HMG42, everyone wants one. Now, retreating on raketens must stay to keep the "i want that" mechanic. 5 man wont cut it and on axis and is just as out of place as a hobo in a spa.