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Glad to hear it has been working well for you. I have been using a M1S upper for a couple years now. I have had the best luck with AA1680 and have cycling sub loads with 150gr Hornady FMJs. Those are much cheaper to plink with than the Sierra 220s.
I had never tried the Corbons, so thanks for that info. By the way, mine is unmodified. I never changed the gas system and I run it on a standard carbine recoil system.
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