'Parashooter' is correct about the wrist being thin.

(The Stock is also likely to have a filled clearing-rod channel).

This is probably the last 'type' of 'thin-wrist stock' with storage for a three section cleaning-rod in the Butt.

It appears there is a 'circle P' function proof mark on the bottom of the wrist. (IIRC - This suggests Armory rather than Field replacement. Since this Krag had already been 'Accepted' earlier, the Armory would not have put an 'acceptance cartouche' on a replacement stock, but, did check and mark it for function proof).

(I suspect the 'curved butt-plate Stock' must be a later replacement, given the rifle's very early serial number).

Definitely a Krag with a neat story!