Am I understanding this right? That traditional sidelock kit guns, like CVA, have no serial number on the barrel, and guns sold fully finished DO have serial numbers? My used Mountain rifle has a serial number, and no indications I can see that it was a kit gun. I'm asking because I would like to clearly understand this point. If this is NOT the case, how would one tell if a kit or not, other than obvious unprofessional detailing? Thanks.