Ok so I bought a National Magazine 40 round Mag and boy are my arms tired. I have been hammering and filing and bending and I still cant get the dam thing to load more than 3 rounds without jamming. I don't know who built this thing but they must not have been able to find a sks to check an see if it actually fit, they must have been going off of memory or something. I have heard that Tapco makes a nice polymer 20 round mag that actually works, I was really hoping to find something a little more high cap. I have a Chinese SKS and I was also thinking that I could convert it to accept Ak-47 mags but I have looked all over and cant find any type of adapter kit. Have heard they are illegal, not really scared. Can anyone help?