'MPF' - It appears there is lead solder holding the 1903 Springfield front-sight on your 26" barrel. If it were my rifle, I would remove the band-pin, screw and front blade unit, heat the solder with a propane torch and knock the banded front-sight base forward off the barrel . Then, I would look for any evidence on the exposed barrel area for the remains of a brazed Krag front-sight dovetail.

BTW - Here is a photo of the special BoO&F rear sight Dick mentions.

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