Back to the factory is usually a good idea -- since, among other things, they will absorb the cost.
Sandy Garrett, of Northern Virginia Guns Work, 7518K Fullerton Rd, Springfield, VA, is a real gunsmith with the training and experience that implies. He did some very good work on my Anschutz .22 rifle (draw-filing rust off a barrel without damaging the roll marks, and then rebluing superbly) a few years ago. He works on S&W revolvers, too.
>> Sandy Garrett | American Pistolsmiths Guild