Barrel swaps with problems are not without problems when sending revolvers to the factory either. Many years ago I sent a 4" S series model 57 in through my local S&W LE sales rep to have a 6" barrel installed. When he bought it back to me it was a non pinned late model 57 with my S serial stamped on it and a 6" barrel installed. He also had a note from the factory service people indicating that the frame was damaged during barrel removal and they replaced it. Needless to say, I threw a fit.

Since then I have not sent anything for a barrel replacement. I still send stuff back to S&W for certain things. But barrel replacement isn't one of them. Being a certified armorer and gunsmith, I do most of my work myself.