PeteM asked for a pic of the barrel markings. It took me a while, but they're below. I noticed there were a couple of stampings on the underside rib. It's hard to see them, but they're "CA" and "JP". Probably the barrel makers (not the tubes themselves, of course)?

Also, I know there's some guys here that really know damascus and I'd be intereted in knowing what kind of damascus the barrels are. Thanks, should someone have an opinion.