I agree with RHD45. The mere existance of one visible pinhole suggests that the barrels were abused and neglected somewhere along the way or perhaps the man who forge welded the Damascus used contaminated material or inadequate flux and introduced multiple flaws and inclusions. On the other hand, considering how much weld joint there is in a Damascus tube, it's amazing they all don't spring at least one leak. That's a testament to real craftsmanship. That, or the scrap pile was a lot bigger than the good pile after proofing.

Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug