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'polandaj' - Your m-1901 sight is a 'mixmaster'.

The leaf for the 1901 carbine sight goes to '23' (for 2,300 yards) and the 'slide' does not shift to the 'left', as you move it up the leaf.
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'polandaj' - Your front-sight base and barrel 'crown' look good to me. I think you have an original carbine barrel.
(The front blade appears to be a rifle blade).

I think you are correct; someone...

'polandaj' - A clear well focused picture of your front-sight and muzzle crown area would tell a lot about your barrel's origin.

There were almost 30 manufacturing operations or steps in the...

'polandaj' - Thanks for responding about your "1894" marked receiver. The 'notch' was done at Springfield Armory during a 'program' to update early rifles to a model 1896 configuration. This happened...

'polandaj' - I am curious.

Your Krag appears to have a model 1896 or 1898 Bolt with the pin protruding from the extractor and other later features.

Is your receiver 'notched' to accept this...

'polandaj' - Your Krag, #187XX, is a U.S. model 1892, that was assembled around July or August, 1895.

With the model 1901 rear-sight & hand-guard and 'hold-open' pin on the extractor, it likely...