S&W can tell you who ordered it (for a fee).
If you did that, then you would know if it came from the factory with the 5" barrel or if someone did work to it afterwards.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)