This is the Remington Model 1903-A3. The U.S. Rifle, Caliber .30, Model 1903A3 was produced from July 1942 until February 1944 for the U.S. Ordnance Commission for use in World War II. As this gun was built under government contract, at the end of production all records were returned to the Ordnance Commission. We do not have an owner's manual available for this model however the military field manual would be FM 23-10. If you look on the barrel, just behind the front sight, you will see the date of manufacture stamped there. There were over a million of these guns produced.