I just got off the phone with several different gunsmiths about headspacing an SKS. None had ever done it before and the last one said that it was unnecessary. He said that they are "so loose that as long as the bolt closes on a cartridge that it's fine." He then said that if it made me feel better he could look at it, but it was fine.
Location: Third bunker on the right,Central Virginia
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In addition- and this is VERY IMPORTANT- remove and clean bolt. Use spray gun cleaner on the firing pin channel (wear safety glasses while using the spray) Cosmoline that gunks up the firing pin can cause it to stick in the forward position- resulting in uncontrolled AWCRAP full auto fire.
What we have here is... failure- to communicate.