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In my experience the AR15 will operate just fine at any normal .223 pressures, usually even starting loads are usually plenty to cycle the action. Probably not an issue to worry about unless your bolt rifle loads were significantly reduced power - it's not like it needs hot loads. Work up just like you would with a bolt rifle and see what shoots most accurately, you'll know if it's not cycling properly. I haven't found them to be that finicky about gas pressure within normal load ranges.
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