Your trigger guard was originally blued from the factory, as was everything except the barrel and receiver, however yours is not original to the rifle. It came from a Smith Corona 03A3 as identified by the "smiley face" semi circular stamping behind the front screw. Remington's were flat, as shown below. Go to http://www.jouster.com/forums/forumdisplay.php?9-M1903-1903A3-A4-Springfield if you want to learn all the nuances.
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