The #48 is believed to be a sub-inspector or stock worker mark. Most Krags have initials or a number in that area. (The exact identity or significance is now unknown).

Nice New Jersey marked butt-plate.

The barrel crown is not the correct muzzle 'contour' for Springfield Armory work. It is likely someone cut a longer barrel to 22 inches.

Then again, maybe the crown just looks odd because a 'step' was turned at the muzzle area to accept the 1903 'banded' front-sight.

FWIW - Fitting a 1903 Springfield front-sight was a common and inexpensive 'Civilian fix' to provide a sight on a shortened barrel. It is unlikely this would be done on a carbine barrel, which had a perfectly nice front-sight base, for which various commercial sight blades were available.

(For comparison - photo of 1899 carbine front sight & muzzle area):

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