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Another thing to watch for is how your brass leaves the gun, straight 3 o'clock is typically indicative of a pretty well balanced gas system, forward @ 1 o'clock over gassed, and 5 o'clock under gassed. This is of course assuming the ejector and extractor haven't been "massaged" to do something different. And this doesn't apply to 300 blackout due to the length of the case and the way it leaves the action.