FWIW - The three snugs method comes straight out of the USMC M16A2 Maintenance manual.
I snug to 30ft/lbs 3x, then tighten to align to the next gas tube slot. Though I've only installed 6 AR barrels, I've not had a problem with this procedure.
Always, always, use anti-seize on the threads, even if test-fitting. Steel nut on aluminum threads is bad ju-ju if not lubed, and a good way to learn about galling. A few cents worth of anti-seize is cheap insurance against a ruined upper.


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