Charles - Welcome to the KCA Forum.

You have a very attractive looking Krag. It has the latter type of 'long forearm' carbine stock and hand-guard, that came in with the model 1899 carbine. This stock type was put on some model 1898 carbines, as replacements, to make them more like the 1899 carbine.

Model 1898 carbines are a problem area in that they are often faked. Only 5,000 were made. They are generally found in the #117536 to #133791 serial number range. Collectors prefer the model 1898 carbine with the earlier 'short forearm' stock configuration.

'Culpeper' has described the model 1896 carbine sight - (worth about $500-$600, by itself). The similar, Model 1896 rifle sight, is graduated to 1800 yards and sells for about $65, by itself.

It is not likely that Krag #195018 was originally a Springfield built carbine. You do have a carbine stock, hand-guard, and apparently a carbine barrel.

It is likely someone has put carbine parts on a rifle receiver. The value of this 'parts carbine' would be greatly influenced by the type of rear sight it has.

Attached photo shows a model 1896 carbine sight:

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