'Sean69' - Welcome to the KCA Forum.

What is "CNG"?

Your Norwegian Krag, #96915, was built in 1911, as a model 1894 infantry rifle.

It is likely, someone cut-down the Stock and Barrel in North America to make it handier for 'Hunting".

It appears to me that the shortened barrel was lathe-turned to machine a 'step' at the 'New' muzzle.

A piece of the cut off section of barrel, (original muzzle area, including the front sight), was bored out to make a sleeve.

The sleeve was then slid on and soldered onto the stepped area of the shortened barrel. Hence, the 'original' front sight and remains of the bayonet lug.

We have seen such 'salvaged' front-sights before.

You should take and post some pictures of your rear-sight and altered stock.