There are identified instances where NPM used Underwood parts. Is there any evidence that Underwood Recoil Plates were used in the second production block in the fall of 1943? My NPM M1's S/N 1955104 places it in the 2nd production block with a NPM Trimble (TN) stock that shows no decay or damage inside the stock at the recoil plate. Why would an armor change a recoil plate when replacing a rear sight? (The sight and sear seem to be the only non-original parts.)Information
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