I read once, that Mike Harvey (Cimarron) had sent or was to send a Krag Carbine to Uberti ( I believe) with an idea to reverse engineer.
as to you question "How Come "
for starters ...huge start up cost VS limited market potential for return
at least a coupla years of planning , designing , tooling up , producing working prototype .
I think it was about 5-6 years ago or so Mike mentioned in his biography UTube video, his wish for the Carbine to be produced.
Where he is with that is at is anybody's guess short off asking the man himself.
I'm not holding my breath.