I'm wondering if any of our military types or history buffs may know... I've got an older 6 digit SN 700 (321xxx) that was factory drilled and tapped for a aperture sight(two screws on the left side of the rear receiver bridge), and has the firing pin that protrudes roughly 1/2" beyond the bolt shroud. If I Inderstand correctly, this is the correct model for the original M40. If so, is it more valuable than a regular Remington action? It was tried by S&S Precision, would that make it "not original"?