Some SKS have/had a propensity to “slam fire.” Go full-auto. This caused more than one shooter to be ejected from a range and also, more than one getting a visit from BATF. I believe it was the early Russian models??
“slam fire.” Go full-auto.”
Yep very true. The firing pin on an sks is tapered, while the hole in the bolt is round. Any rust or surface deformity on the firing pin and it may get stuck forward. In this case everytime the gun cycles it will fire. Usually a good cleaning will take care of it or in bad cases a new firing pin.
Also with all the wore out chinese milsup out there I have seen loose stocks cause bump firinf, which runs a pretty fast rate too. Although at least that problem will stop firing once your finger is off the trigger lol.
Some of the Russian models had an especially heavy coat of storage cosmoline, even in the firing pin channel of the bolt. It took a lot of solvent and scrubbing to ensure that the firing pin wasn’t going to “stick” and cause problems.