I am aware of both Parker, Lefever and Fox barrels that were struck that thin in the factory! These are not uniformly thin but usually a section found on the side or bottom of the barrel. And yes, I'm satisfied the bores haven't been honed or the barrels refinished. Very few guns have had their wall thickness' accurately measured. I recall a very nice Belgium boxlock I was attracted to in Tulsa. Price was certainly right and everything looked right. Fetched my wall thickness gauge and ran it up the bores. A whole lot of the front end measured .011 or thereabouts! Amazingly, the seller seemed to instantly develop a hearing problem....obviously, I passed....and ran!

John McCain is my war hero.