My nephew got a norinco sks and it came with a steel 30 round MAG that would not feed. I bought him a tap co 20 round MAG for his birthday and he is a happy camper, works fine. About $20.00. Cheaper than dirt is your friend for the sks, check out their products and you can also read the reviews about the products other users have posted up. Always read reviews, valuable experience and information can be gotten from them. Sportsman's guide has a lot of goodies also. I will repeat what somebody already said, that it may be illegal to use a large capacity magazine on the sks. I may be wrong, but I think that if you're going to do that, then the gun will have to have some other U.S. made parts on it.