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Missed the question back awhile ago. My pistol ported 16" barrel would not cycle subsonic 150gr loads originally. In the end, to get it to cycle, that barrel had its gas port opened up to .101~.102" and had the standard gas block on it. I then switched to an adjustable gas tube but after forgetting to turn it down one day and blowing the ejector and ramp off the bolt/carrier I have since switched to a three position gas block.
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