I bought a ProMag 30 round mag for my SKS today. I brought it home and tried to put it in and it didn't fit. The SKS is a Norinco and it is stock. I looked up a couple vids on YouTube and everyone had aftermarket stocks that were using the ProMag magazines. I have thought about getting a stock for it but don't know which I want. The main difference I see in the mag that I already have and the new one is the "ducktail". On the ProMag it seems to have more of a point at the end. I will provide a picture of both for comparison. Any help would be appreciated.