[Helix_FR]

McGowen, Criterion and Shillen I've had really good luck with. I lean towards McGowen bc they have no problem with sending out a bored blank so everything is perfectly customizable.
Welcome to TFF.

 

[Helix_FR]

In St Louis area there are a few gunsmiths listed but only a few do it full time and have a full machine shop. Many advertise as gunsmiths but are really armorist or just job the work out that requires proper equipment. Otto Batista from Ottocomp is in Lemay, Paul from Redbrick is in House Springs and there is myself "Helix" in Arnold. The choice is yours, we all can handle it and have experience in 700's.