If SKS stripper clips held 20 rounds I could see a use for it. But given that they are less than reliable and there's no practical advantage after the first 20 rounds, I'd seriously say stick to the original 10rd.
The Chinese had some 20 round fixed mags(had a star? on the side of em). People say the either worked great, or were crap. However, I haven't seen many around, and I think they are getting expensive. I guess you could try eBay and Gunbroker.com.
I found one on autionarms.com but it was sold minutes before I was going to get it. THey work great and never fail. I had a 40 round detachable zytle that I shot several times over. Anybody want a zytel mag???
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