The only one I know of up here is Belchers in Mishawaka. I know they cut slides and do cerekote, both of which seem to be done pretty good. But I think he's a full service gunsmith. I can't speak of the quality of their other stuff. I've heard neither bad or good about them.
Since it's just the barrels, you could ship them to AllenM in Avon. He's a member here and has proven he's good at what he does.
Try Mr. Mark Penrod at (260)-982-8385
Personally dealt with him and he is absolutely outstanding can not recommend him strongly enough. Well worth your drive.