When SA, INC. Geneseo, IL., started production on new cast receivers, they were duplicating military M! receiver serial numbers. BATF told them early-on to start a 7,000,000, well after military M1 serial numbering was over. It's unknown how many 3-digits were made, perhaps 500 or so.
Ramboueille,
So Geneseo started duplicating original M1 reciever numbers by starting over with low numbers and then forced to go to 7M?
Also any idea on what the steel would have been on the earlys? Triple alloy like an 8720, 8740?