Maybe he meant...
... a 7.62x51 AR, or a 7.62x39 AK?
I've never seen a 7.62x39 AR; I have seen (and committed) many a typo.
Just did a Google search, though, and Del-Ton sells 7.62x39 AR uppers. If one company does, others probably do, so maybe he did mean 7.62x39 AR.
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