It happened some years ago, what I thought was a clean SKS I had just bought turned out to be packed with cosmoline inside.
Barrel was clear so I proceeded to check it out.
My dumb mistake for not stripping it down first, fortunately for me I had only 5 rounds in the well. I do believe you can get a modified firing pin now and a return spring for it.
But like most firearms I have some I just won’t waste my time and money with, just enough for me to trust it with my life and to use as a stepping stone to procured more advanced weaponry to go beyond what the opposition uses.
thats what irks me, so many want an AR they are begging on many forums, but even a tricked out one is still below the level of what we may have to go up against.
Most people find out about the turned over pin after cleaning the bolt ,and not watching what they’re doing.