There's a guy on Facebook named Richard Ling.  Not sure if he's here on the KCA (if you are Rich, well done on being incognito, LOL).  He regularly resurrects Krag... and always to an as issued condition.  He never fakes anything or misrepresents/claims it's not resurrected.  He's one of the good guys!  Anyway, he has used Criterion barrels, and may know how to install the front sight to look accurate.  Maybe look him up.  He lives in Texas, BTW.