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I am not familiar with that semi-auto PPSh, so some of this is guesswork.
First, it is NOT overpressure. Is the firing pin of normal size and does it fit snugly in the bolt, or is it a tit on a firing pin rod that fits inside the bolt?
If the firing pin is the normal type, it looks like the firing pin hole is supposed to have a bushing and it somehow got lost or pushed back into the bolt. If the firing pin stud is part of a rod, the firing pin spring is too weak, possibly cut down or weakened to reduce trigger pull.
The recoil spring may also not be strong enough or the bolt mass too little as the primers also seem to be backing out.
IMHO, it sounds like a factory problem and a factory job to fix it.
Jim
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