How to measure barrel length:
Make CERTAIN weapon is not loaded. COCK the weapon so that firing pin is not protruding from bolt face. Insert a rod into the barrel that is close to bore diameter, mark rod at the muzzle. Withdraw rod. Measure rod from tip to mark. NOTE: Revolvers are measured from the muzzle to the face of the forcing cone.
Yes, I know, that also measures the chamber along with the barrel. Sorry, I did not write the process, that is how it is done.
What we have here is... failure- to communicate.