Looking for some help...I have a Yugo SKS M59 that is only "dimpling" the rounds and not firing. I thought it was the bolt and firing pin, so I bought a new complete bolt and installed it...still doing the same thing! Anyway have ideas of what the culprit might be? What I should check next? I'm thinking maybe a headspace issue, but unsure of how to check that on an SKS. Other ideas? thanks.