As 'Kragrifle' states, the front sight-base of U.S. Krag carbine and rifle barrels exhibits a very shallow 'dovetail'.
There were something like 30 manufacturing steps at Springfield Armory in the manufacture of a Krag barrel.
At around step #18, a dovetail was milled across the unshaped and unrifled barrel blank and a small block of steel was bronze brazed into the dovetail.
This 'block' became a fixed-point, that the barrel shaping & taper, rear-sight holes, 'clocked' or timed barrel threads, barrel index-mark, and extractor-cut, were all based on.
Ultimately, this 'block' was shaped, slotted, and cross-drilled, to become the front sight-base.
The Krag barrel was actually a fully manufactured, proofed, and "browned" (Blued) item, when it finally 'met' and was screwed into its fully finished 'case hardened' receiver. (Wow, interchangeable parts)!
The machine work and "browning" (rust blue) make the attachment of the Krag sight-base very subtle. Close scrutiny will usually reveal the color and outline of the bronze seam.
(IMHO - The OP's model 1896 front-sight attachment looks oddly done. It does not appear to have the Springfield Armory manufacture characteristics, shown in the two attached photos).
krag 1899 carbine sight.jpgkrag front-sight barrel attachment.jpg
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