Sounds like the recoil lug being thicker is the issue. Still got the thinner one? Put it back on or try to run the nut up the threads a little more. I've run into the same thing with shorter barrel threads. That's the reason I stick with the thinner recoil lugs. Depends on who cut the barrel threads. I've had some cut "just a little longer" so the thicker lugs can be used. Either have the threads lengthened or stick with the thin lug. If the headspace is set to propes specs, you're good to go.
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