I had surprise after I first started reloading for my chinese SKS. Let the bolt go home and the round went off. I took the rifle back into to the shed and tried some more brass with just primers in the brass (CCI primers) Bang again and again. I tried another brand -RWS same thing. I took the firing pin out and found no return spring on the firing pin I was told and have read that early originals had a spring. I ground down the hump on the firing pin and and put a spring on.
That was the end of the problem, but I was unhappy with the spring I had to use. Recently I was searching the web and found out that a neighbor of mine developed a firing pin with spring. I was shocked- first that someone else had been making this and second that I had a neighbor only a few miles away who was a gun smith. (we are real rural in this part of the world 18 miles to the post office and only one other store 24 miles in any direction)
The kit had a better springs a new pin and dropped right in.
http://www.murraysguns.com/sksown.htm
It's kinda pricey I though and anyone probably could do the same for ya
Another option is to use harder primers, but I have heard of several more slam fires using military ammo. (hard primers were not an option that I had heard about when this first happened )
I was also told by another individual that a slam fire lead to a cook-off in his chinese sks with store bought steel case ammo but did not witness this.
Any one else have this happen to them? or can verify it?