Thanks for the information, especially the barrel thread.  Serial number says carbine.  I'll probably buy a complete one eventually, but rebuilding/refinishing old guns is my hobby so I think eventually it'll get rebuilt.  I've just never had a Krag before so its a new type of rifle for me.  I've always wanted one so I hurried up and bought it at the auction for $50 thinking it was a US model.  6.5 is a nice cartridge anyway.