Krags are super simple to change barrels on.
I had one Kragicon 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.