Hi Bob W,

If you you have the rear sight holes unplugged than here's another option.

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Personally I'm more of a traditionalist but if it's a sporter or kinda sporter than the Kraghaus rail system is nice alternative.

For the most part, no harm is done to the rifle and you have various sighting options to pursue.

Otherwise, I like Culpeppers option of having a repro front sight installed and purchasing a 1901 rifle rear sight.

BTW: Going by Poyer's book 'The American Krag Rifle and Carbine', your Krag was produced between Jul-Aug 1900.