Can anyone tell me how to tell the difference between a new Springfield Armory Inc. Garand and an old production Springfield Armory Garand? This particular example is in .308, and I don't know if new prod. Garands in .308 were built with a shorter reciever or standard length. I can always have it rebarraled to .30-06 later if it is an old production Garand if I want to, but I don't know if this is one is new or old. I don't have the serial number, either. Can anyone help?