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loading and shooting one round at a time, and seeing if the bolt locks open on an empty mag can tell you if the carrier is making the trip all the way to the rear. though sometimes an overgassed gun will cycle too fast for the magazine spring to push the bolt catch up. A little finger pressure on the latch will make sure it comes up. If it doesn't lock open on an empty mag, and if it doesn't lock open with a little finger pressure, the bolt carrier isn't making the trip, which probably equals undergassed.
Are you confident of the gas tube alignment with the port when you added the adjustable gas block?
your idea of trying without the can is good. You added two variables - can and gas block - and testing them one at a time will help you isolate the problem.
 

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one addition to my earlier post: if it doesn't lock open on an empty mag, but does lock open with a little finger pressure on the bolt catch latch, then the carrier speed may be too fast, and you're looking at overgassed. Hope that helps. Let us know what you find.out.
 
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