The original 26" Acme barrels have plenty of wall thickness. The minimum wall thickness is .022"
The 30" Titanics added later have the .014" minimum wall thickness. I believe that in that location 9" from the muzzle the risk is in getting an unrepairable dent by dropping, closing in a car door, or otherwise banging the barrel in the thin spot. The dent would not be repairable. I woudn't be interested in shooting the 30" barrels if the .014" thin spot was at the end of the forcing cone.
Best,
Mike
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