A couple of weeks ago, I bought an M-1. I called Springfield about sending it in to make sure everything was up to specs, and to repair a loose rear sight. I spoke to a woman representative who asked for the serial number, and when I gave it to her, she told me that Springfield didn't make that rifle. It has a Springfield stamp on the receiver. Did Springfield ever authorize someone else to use their stamp on the receiver? Then she told me they didn't work on anything made before 1976. Have I been fed a line of B.S.? Thanks in advance.