'Krag hunter' - Welcome to  the KCA Forum.

As Whig stated, your Krag appears to be a 'cut-down' model 1896 rifle.

Your rear-sight appears to be a model 1896 sight to me.

The 1896 carbine rear-sight was marked with a "C" on the right-side of the base.
The 1896 carbine-sight leaf has graduations going up to 20 (2,000 yards) with a "C" on the right 'leg' of the leaf, even with the 20, which is at the top face of the left 'leg'.

The 1896 rifle-sight leaf only goes up to 18 (1,800 yards) with no "C".
There are differences in the 'eye-piece/slide' of the carbine and rifle 1896 sights.

Should you have a correct & complete model 1896 carbine sight, they are quite valuable (worth over $500). The rifle 1896 sight is only worth around $50.

It looks like your barrel is about 26 inches long with a 1903 Springfield front sight installed. Springfield Armory did not make this combination.

Krag carbine barrels were exactly 22 inches long.