It could be a Krag full length Rifle and then a Krag carbine?
They made them both, and I believe in almost the same amounts. I usually see more carbines than rifles at shows.
For what it is worth, my wife's grandpa hunted deer for 40 years or more with a Krag carbine with a side mount Weaver 4x on it in PA, and killed his fair share of them right up until the season before he died, when he got his last buck.
I still have his reloading gear for it, but a worthless bro-in-law got the rifle, which he promptly sold probably for drug money
I am reminded of it and him every time I check prices on Krag carbines at shows, and see how much they have appreciated since then