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Until I see some documentary evidence to the contrary, I will assume that a ground "mum" indicates a rifle taken from depot storage and ground by the Japanese workmen before they were turned over to the Americans. Almost all of those rifles not retained by the US (some rechambered for .30-'06 and given to South Korean police) or brought home by GIs were destroyed.
Bolt covers and monopods were often removed by GIs either before or after the rifle came to the states, usually as a preliminary to "sporterizing" the rifle, but sometimes just because they looked funny.
Jim
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