Disregarding the serial and model year, the bogus front sight base is a dead giveaway that the barrel has been shortened. Original Krag front bases are dovetailed and brazed directly to the barrel. The base on yours, probably the 1905 model for the Model 1903 rifle, appears to feature a band around the barrel. This was a common expedient for sighting a cut-down rifle without the careful fitting and finishing required to install an original-style base.

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Original Krag sight base attachment.