I wouldn't say the new-production M1 carbines sell well, certainly not compared to an AK.
It's hard to imagine a way in which the SKS can compete with the AK in the civilian market. The gigantic steel receiver is expensive to make. Saiga AK's come in a variety of calibers and barrel lengths.
I like my SKS as a collectible and do shoot it, but it wouldn't be my go-to rifle since it sits next to a very serviceable AK.
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