'Foudufoot' - Welcome to the KCA Forum.

Likely, either hand-guard can be correct, on your model 1899 carbine.

Your carbine, #359184, was assembled around November, 1901.
This is before the carbine hand-guard with the 'protective-hump' was approved and made. (The model 1901 sight 'protective hand-guard' was adopted - February, 1902).

If the original rear-sight on your model 1899 carbine was the 1901 carbine-sight, the "rifle-style" hand-guard would have been used.

(It is also possible your carbine was subjected to a variety of sight and hand-guard updates, which could have included the protective hand-guard).

Aren't Krags Fun!