'coaspen': Welcome to the KCA forum.

Your model 1896 Krag, #57656, is most likely a model 1896 rifle that was 'cut-down' and possibly put into a model 1896 carbine stock. Your Krag's serial number is outside the range for model 1896 carbines. (I can not see enough of your stock to tell if it is an actual carbine stock).

Your bolt-sleeve is from a model 1892 Krag. Someone has removed the Magazine Cutoff from your Receiver and the Safety from your Bolt.

Springfield Armory never used 'banded front-sights' on U.S. Military Krags. Your front-sight is for a model 1903 Springfield. Someone slit the band, so it could fit on the larger diameter of the Krag barrel, and then filled the gap with solder. This was likely done by a hobbyist/hunter.

I think your rear-sight is a Krag 1902 (sight) leaf on an 1898 (sight) base. It has been placed on the barrel very far to the rear and is not armory work. Your Krag is missing its  wooden hand-guard.

It looks like a Krag someone put mixed parts together to make a 'Hunting Rifle'. It should be a fun shooter.

(IMHO - If your Stock is an unaltered model 1896 carbine Stock, it is worth at least $400 by itself).