I have an Olympic upper. It works fine. The problem is not the upper or even the idea of 7.63x39 in an AR. The problem is no one makes good magazines - or at least none that I am happy with. Check out the magazine situation carefully before you spend your money. It is a lot cheaper to order and evaluate a magazine than an upper.
If you are not an AK/SKS fan, maybe a Mini-30?
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