How about serial number range, type of rear sight (and markings), and type of barrel band (and markings). Those who know more than me will need that info. The underlined M mag catch is a M2 style, and was not introduced until 30 round magazines introduced. I believe at first only used on factory M2s and M1s upgraded to full auto by Division armorers in the field. Was added to some M1s in postwar rebuilds.
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