Clearly you have never seen PPSH troops at max range before Penals absolutely tickle grens. They can even wipe a squad at range 35 in 322 seconds on average. The PPSH is a close range weapon it should not be this strong, its OP at ALL ranges.
Given the buff to mid Accuracy and the higher DPS bonuses of the Penals things are not very simple.
This should be the DPS of a vet 3 PPsh Penal Squad:
Ranges 0/10/15/20/25/30/35
110.85/110.85/51.85/18.07/6.93/1.34/1.34
I would not call them OP at all ranges but they do have decent DPS even close to range 25.
(They close accuracy is above 100%)
(Edited.)