Part of the problem that caused M1903 Springfield rifles to blow up was incorrect heat treatment of the receivers. This was on receivers numbered below #800,000 from Springfield Armory and Rock Island Arsenal #285,8XX. (I CANNOT FIND THE EXACT NUMBER OF RIA, but it was at least that high!) I would NOT fire Springfield M1903's with serial numbers lower than about 850,000 just to be safe. After that, some of those rifles were re-heat treated (so-called "double heat treatment" receivers), but the big change was to a different steel. This whole business does not seem to apply to Krag rifles and carbines. See "Hatcher's Notebook pp212-235 or so. IIRC, P.O. Ackley tested some of the low number, and possibly higher number receivers, and found they were so hard and brittle, if you tapped them lightly with a hammer, they would shatter!
I'd have to believe, the way prices and costs of reverse engineering, tooling, etc., are going up, that a repro Krag would run in excess of $2,500. But that's just my guess.