Knute, I've found no markings that would indicate my barrel isn't just an original Krag barrel that's been shortened to 26", nicely re-crowned, and a Redfield band type front sight installed.

What 1903 sight do you mean?  I thought the 1903 Springfield rear sight was on a sleeve and didn't use a dovetail.

By the way, when I bought this rifle its 1896 rear sight was installed backwards to cover (hide maybe?) the big dovetail.