Model 1899 Krag

[butlersrangers]

OP's Krag model 1899 receiver, #280510, would have been originally assembled as a carbine.

It is from a serial number range that was manufactured when the 'knobless - striker' was being manufactured, as an economy move.
This receiver was likely manufactured in August or September, 1900.

Your stock is a model 1899 carbine stock.
If there is no cartouche, it could have been a 'spare' replacement stock.

Also, it could have been scraped during refurbishing and the cartouche 'removed.

The barrel is probably a shortened Krag rifle barrel, that someone used to replace a rough carbine barrel. It also could be an altered 1903 barrel.

The 1901 rear-sight is a rifle sight with the leaf calibrated to '20', (for 2,000 yards).
The carbine model 1901 sight-leaf was calibrated to '23'.

You have a rather nice 'parts' Krag that should be a good looking and fun shooter.