I don't know about the numbers produced on the two models you mention, but I am curious to know if the gun in question has the GC prefix on the serial number. A guy brought a Government Carbine into the Cobb County show this weekend that he had purchased new, and looked as if it had just come out of a time machine. I tried to buy it from him but he wouldn't sell. It would have been a great match for my unfired Government Model (green label 6550). Sorry I could not answer your question.