I have heard 40 grain to 80 grain
Head to Walmart and buy whatever's cheapest. Just because some other "expert" tells you something there's no reason you should fall for that dreg and there's no reason to pass it on. Your gun will fire *any* common 5.56 ammo. Buy whatever's cheapest and that will run reliably in your gun. You aren't sniping terrorists at 1,000 yards.
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