I recently purchased a Saginaw M1icon Carbine at an auction. Just now starting to go through it, and I'm seeing some things that are different from the information in Craig Riesch's book, so I'm puzzled at this point. Serial number is 3253xxx, so the carbine is early in the first serial number block for Saginaw. Receiver is clearly marked "Saginaw S G" with no periods (.) after the S or the G, as shown in the receiver marking table in Riesch's book. The forward receiver lug has a "J" stamped on it, and there is a "C" stamped on the flat about an inch in front of the gas piston, markings that aren't mentioned in the book. The real puzzle is that the receiver has a narrow locking tang, not the wide locking tang that Riesch's book says it should have.

A lot of the other parts appear to be correct - trigger housing, bolt and op slide are all marked SG, and the barrel is marked Saginaw S.G. Div/General Motors in two lines.

Basic question I have -- has anyone seen similar receiver markings and the narrow locking tang on Saginaw carbines?
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