Krags are super simple to change barrels on.
I had one Krag that the chamber was drilled out of to “deactivate” it.
I removed that barrel and put on another used one that indexed perfectly. I went cheap and after a couple years decided I didn’t like the bore. Bought another barrel and it too indexed perfectly.
They were made for such a short period of time and by true masters that part interchangeability is truly amazing.