Does it need level 25 on the PPSH to get the 71 round drum mag ?
If you play on official Tripwire servers you have better chance of having your leveling stats saved.
So far I got jack squat, I've leveled the DP28 and SVT/G41 which gave me 1% boost to the stats
What about everyone else?
I got the nuclear chaingun. It's pretty awesome.