Jim,
The serial number of my 1903a4 is 3418392. The barrel date is 6-43 with a RA on it. The receiver, safety, bayonet bands, scope base and rings are parked. The the following are blued: entire bolt assembly, bands, sling rings, bottom plate and trigger guard. All parts are marked with an "R". I think it is a two groove barrel. The scope is a m73B1 with a serial number 20961 etched on the side of the scope. I appreciate you helping learn more about my rifle.
Bob