"My understanding is that the 7.62x39 won' fit on a standard AR lower and requires a dedicated lower, something to do with different mag well because of curved mags for the 7.62x39 round. Am I wrong ??"
Yes, you are mis-informed. C-Products and a couple(?) other companies make reliable magazines for the 7.62x39 AR platform. I've been shooting a 7.62x39 AR for years.
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