In general, if you see an "all original" M1 rifle, you are looking at one that was assembled from selected parts, usually after its service life. Very few M1 rifles in U.S. service have not been rebuilt and upgraded, sometimes more than once.
An exception must be made for the "British" M1's that were sent to England before U.S. involvement in the war and, because of ammo differences, were never issued and spent the war in British depots. Those came back in the 1950's and, unless modified since, have all the original parts and original cartouche and ordnance markings.
Jim
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