I too would be curious if this was sporterized or in original military configuration.
Original military Krags are becoming increasingly valuable. There are three basic rifle models -- the 1894, 1896, and 1898 -- as well as various carbines and other variants. There are several models of rear sights, any of which can be found with any of the model rifles. (They just screw on, and substitution is easy.)
One of the "holy grails" of U.S.military collecting is an unaltered Model 1894 Krag (with a full-length cleaning rod, straight buttplate, and no butt trap). Almost all of these were arsenal-converted to the 1896 model, by filling the cleaning rod channel and altering the butt. The handful of surviving unmodified originals are worth really big money. If you see a Krag with a full-length cleaning rod under the barrel, buy it!