Only other way is to wait for Xur to sell legacy primary engrams. Try for the y1 version and then buy the year 2 version from the kiosk.
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That'll get expensive due to all the other y1 primary exotics. Bye bye strange coins!
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It could for sure. I have had better luck with non duplicates with the legacies. RNG I know but I did get The Last Word on my first legacy engram. If that's what he really wants it could be worth the cost. It could also open up some other exotics he doesn't own too.
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I've noticed that as well. I bought 3 or 4 a while back and got different weapons. If I was to decrypt 3 or 4 at a time, 1 would definitely be a duplicate.