Both Sinman and SSS could do the work for ya but I doubt either of them have those reamers. You would have to buy or rent a reamer.

No gunsmiths in my area so I go to SSS or Sinman. I've had work done by both and everything has been great!

Reamer Rental:

http://www.reamerrentals.com/

http://www.4-dproducts.com/

To buy:

www.pacifictoolandgauge.com