Model 1899 marked Krags were built as carbines, so you know you have a legitimate carbine.

Some of your metal parts appear to have a copper cast to them. This is likely from 'Plumb Brown' and 'Cold Blue' metal touch up. (I thought your front-sight blade was brass at first).

Your wood appears to be Italian walnut that has been stained and refinished. A lot of these stocks were used in 1899, 1900, and 1901.

This is a good Krag to use without guilt about using it.