I don't believe your Norwegian Krag is a model 1912 Karabin. The rear-sight is in the wrong location.

It appears, to me, the barrel has been shortened and the rifle front-sight was salvaged and dove-tailed into the barrel.

The 'flange' at the front of your receiver and your trigger-guard suggest your new Krag is a 'cut-down' model 1894 Norwegian infantry rifle.
Your bolt-handle is the style found on Norwegian rifles.

The model 1912 Karabin is usually found with a 'flatter' bolt-handle and different style trigger-guard.

Norwegian bolts were serial numbered to match the receiver's number. (For some reason there are now a lot of mismatched bolts & actions).

I suggest you leave the 'sportered' Krag, as is. You can still double your investment.

I am on 'The Road' and unable to check my copy of Brophy's, "The Krag  Rifle".
If another KCA Member could check the Norwegian Chapter in Brophy's book, it is possible to look at the various Norwegian models and confirm the model for: The year 1914 and serial #106028.