
M1 Carbine Production Inland Manufacturing Division, G.M.C…… Six different prime contractors (Inland, Winchester, Saginaw, IBM, Underwood and Rock-Ola) and at least two subcontractors (Buffalo Arms and Marlin) manufactured the Ml carbine barrel during WWII. Who made barrels for national postal meter M1 carbine? The two serial numbers appear to have been stamped at different times. The only unusual aspect of the gun is that it has a serial number in the normal location (behind the rear sight), but the same serial number is also stamped in front of the rear sight. Q: I recently purchased a “G.I.” M1 carbine. Where is the serial number on a M1 Carbine?

