Hi Bullets.

A carbine marked 1899 started out as a true carbine, so I'm perplexed as to why the 1903 banded front sight.  Did it have a rifle barrel installed and then cut down?  What is the length of the barrel as measured from the muzzle to the closed bolt face?  A carbine barrel should be exactly 22 inches.  Also, that banded front sight is installed backwards - the ramp should taper towards the muzzle with the sharp edge towards the receiver. 

I'm curious about the rear sight too.  It's a 1902 model.  Based on the height of the ramp, I would guess it's a rifle sight.  Is there a C stamped on the side of the ramp?

It could be restored to a full military carbine if you were interested in a replacement handguard, and a replacement carbine barrel.