My first SKS (Chinese Surplus, many years ago) wouldn't feed - turns out the follower was slightly sideways (bent) and when you got to the bottom of the mag, it would mis-feed. As soon as I figured it out it took 2 seconds with pliers to fix. None of the other SKS's (7? 8?) I've owned ever had an issue. Not high tech, not fancy, not easy to use as a military firearm, but damn, they always go bang.