![]() ![]() ![]() Not until serial number H001 did Plainfield remain relatively consistent with their markings and the receivers they were on. ![]() Serial numbers ran consecutive and changes in markings or receivers were not identified by any particular serial number sequence.Especially the very early ones machined by owner William Haas. Generally, the casting and machining of the majority of receivers was well done. Some of these apprentices were still in high school. Plainfield is known to have employed machinist apprentices in the production of their firearms. The quality of the investment castings and their machining varied at different times. In this section will cover these changes chronologically and will include serial number sequences, when known. The design of the receivers changed over time as did the markings. Post WWII Commercially Manufactured M1 Carbines (U.S.A.)Īll of the receivers used by Plainfield Machine, including those used for Millville Ordnance and H&S, were manufactured by investment casting. ![]()
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