They got up to speed within a month and did a great job of getting carbines out the factory. was the last contractor to get into carbine manufacture. Many of there other parts were manufactured by other I.B.M. Parts made directly by I.B.M.: Bolts, Receivers, Barrels and slides. Primary stock & hand guard supplier: Rock-Ola, Jamestown Lounge, Lumb Woodworking, Sprague & Cartlton, and Milton Bradley. Serial number blocks assigned by the government: M1 Carbines 346,500 (I.B.M., did not make the M2, M3, T3, or M1A1 Carbines) Approximately 346,500 total Carbines were made by I.B.M.
Average Cost to Government per completed rifle, $42.29 Main Manufacture and identification codes: "B" International Business Machine Corporation
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