I don't know if this is the right spot to ask, but I have a Mod 29 question. I have had my 29-2 for a few years and have seen 4, 6 and 8 inch barrels mentioned. Mine is a 5 inch, and I was wondering if that was ever an option. The serial number is N813XXX, and from the looks of it was at the tail end of the 29-2 era. Any information would be helpful.