Please feel free to PM me or post for any errors or any further information. carbine with a Inland slide, its possible it left the factory just like that. in 1943.Įxample: You have an all matching I.B.M. Underwood shipped approximately 10,000 hammers to I.B.M. Underwood shipped approximately 5,000 recoil plates to I.B.M. Underwood shipped approximately 14,000 sears to I.B.M. NPM shipped approximately 20,000 rear flip sights to I.B.M. NPM shipped approximately 1,000 trigger housings to I.B.M. Inland shipped approximately 27,000 slides to I.B.M. Inland shipped approximately 200 receivers to I.B.M. Inland shipped approximately 10,000 bolts to I.B.M. (most parts were shipped together in groups, magazine catches with sears, etc) Here is some known shipments to I.B.M., how ever there could be more shipments that occurred that are unknown but this is a good reference. So don't get super disappointing if your Carbine is not all matching, its possible its exactly how it was when it left the factory!!! An example say Underwood was low on sears, Inland would ship some Sears to them. Just because its all matching doesn't necessary mean that is how it left the factory. ****** There is a difference between an all matching carbine and how it left the factory, a lot of M1 Carbine contractors shipped parts to other Contractors. All matching vs how it left the factory: Figured out new manufacture techniques that reduced costs and were the first to develop a new rifling procedure that greatly increased barrel production. 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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