Thanks mike. I was thinking that the barrel looked a little too pristine. You can not see it from the pictures but the barrel bluing is in much better shape than the rest of the gun, except at the end where the barrel was too long for the holster and it shows some wear. I bet that is why the inside of the barrel shows no black powder pitting. I am glad the barrel was replaced before they stopped working on these at the factory, I suppose the new barrel change out is a good thing in a way.

What is the dual-caliber stamping you speak of?