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Id take the barrel off and inside the gas collar there must be some kind of porting orifice arrangement where the low setting is being restricted with some kind of dirt in there you cant see..you may need to run a wire through it or if that doesnt work you might let someone knowledgable enlarge the port/ports to allow more gas to pass using your lightest loads as a control benchmark..check to make sure any piston rings/seals at the end of the bar are in good shape...hope that helps