An interesting little fact that I found out with my Chinese SKS, and I'm not at all suggesting that what has been posted in regards to cleaning after firing military FMJ is false, this is simply "my" personal experience:
I had fired some corrosive primed ammo but waited a couple of days before cleaning due to time constraints. No corrosion. Next time, again due to timing, it was a week, still no corrosion. As of late, it has been two weeks as I wasn't concerned due to previous experiences, still no corrosion, not in the barrel, not on the gas piston or tube. Perhaps this is due to the fact that I treat the affected parts with G96 on re-assembly. Again, not suggesting that they not be cleaned, simply reporting my personal findings. I should add that mine is stored in a dry environment.
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