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There is a shoulder on the barrel aft of the gas block. If you push the gas block back against that shoulder, it will cut off the gas flow. Make sure there is a gap between the rear of the gas block and the shoulder. The gap should be about the thickness of a dime (thickness of the forward handguard cap).
I always mark the barrel and the gas block before installation. Then install the gas tube into the gas block. Then slide the gas block onto the barrel, line up the marks and tighten the allen screws.
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