what's the proper way to finish a frame with a plunger tube? can i install a blue plunger tube on a white frame and then get it blued or do i have to blue the frame, install the plunger, complete the pistol and send it in for rebluing?
I'd suggest you go with Plan A, finish all your polishing to the frame, then install the plunger tube, then have it blued. That way, you won't risk scratching up a fresh blue job.
You can do it either way, though.