No problems with the 2” barrel fitting, but a tapered barrel on a frame for a bull barrel will look unusual (the contours of the frame are different for a standard barrel). I think I would shoot the 4” because the pitted rifling may not make any accuracy difference. If it does or the finish is ugly, perhaps shortening it back to the currently fashionable 3” length would work. It would also eliminate the need for the shorter extractor rod of the 2”. Good luck in your decision.

__________________
Alan
SWCA LM 2023, SWHF 220