Depends, Roy's records for RMs are filed by Registration number, not the serial number, so if you call him for a quick question be sure to have the Reg. # ready. Do not expect any indepth discussion, as his time is limited, unless you have found J.Edgar Hoover's Reg. Magnum. For full details, order a factory letter and supply ALL details (every measurement, every stamping & every marking & exact location) of the gun & photos with the order, if you want a fully detailed letter. Ed.