Rifle is 1898 Krag, 1896 rear sight, correct front sight, full barrel, stock good with P behind trigger guard but no cartouche, bore shiny with fair to good rifling.  Appears to be original configuration, but the bolt and receiver look like they were blued.  Blue job not recent, very well done, has its own patina.  Could this be an arsenal bluing?  Owner wants 500, is this reasonable.  Can bluing be "reversed" or just leave it alone if I buy it?  Much obliged for any opinions.