I make bolt face bushings with a flange (looks like a top hat) and the bushing is pressed in and retained with LocTite. The bushing is drilled from the front after installation. The bushing has to be long enough to support and guide the front of the firing pin. After installation, the bushing is invisible.
I have one on a Model 70 which has been in place for 15 years. Threading a bushing is a good system when it is possible to thread the bolt. This is not always possible (sometimes they are just too hard) and a press fit works as well. GD
