Certainly does sound like too much gas getting through. Adjustable block would sort that. Try advertising around the forums & email the usual suspects who sell AR stuff. Serious Shooters had them but are showing out of stock. If you are really desperate you could try squeezing the gas tube a little to restrict the volume getting through. Just a little at a time as theres no going back. Good idea to have a spare tube before you start cos theres a good chance you will wreck it without fixing the problem.. A tip from Bubba gunsmiths Inc.
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