The point is that PPSh-41s obviously don't cost 2 CP, they don't become quasi-elite infantry (on which the Soviet faction depends) that also comes at 2 CP, it doesn't give them strong bonuses at 2CP.
Actually PPsh has received multiple buffs and if it does not feel like "giving them strong bonuses" that has do with power creep. It even used to be CP 3.
It is worth thinking about changing the ability, it clearly does not deserve a whole ability slot from the commander. It can give PPSh-41 as a non-doctrinal alternative and replace PPSh-41 with DP-27.
LMG(smg) for conscript would be bad for a number reason:
Conscripts are already a very cost efficient unit, any more buff and one will not see Penal again.
Concentrate DPS on unit with high entity count give the advantage of being able to fight for long time with little DPS drop.
Combination of abilities like sand bags and ourh with lmg would make conscript even stronger.
It would mess the dynamic design of relative positioning of fight since both side would prefer static firefight in cover.
The only change imo need are separating the two abilities (goes for camo/sprint also) and change the ability to provide 6 PPsh while adjusting DPS.