Parts subcontracted by IBM would all include their manufacturing code, the letter “B”, in addition to the subcontractor’s letter codes. The company only made four parts in-house: receivers, barrels, bolts and trigger housings. Like virtually all of the carbine manufacturers of the period, IBM engaged a large number of subcontractors to make their carbine parts. They did not produce the M1A1 folding stock paratrooper or the select-fire M2 models. IBM only manufactured the “standard” configuration M1 carbine. While the cost per unit price varied from contract to contract, the average price paid by the U.S. Serial numbers of IBM carbines range from 3,651,520 to 4,009,999. The M1 carbines produced by IBM were manufactured at Plant Number 4 located in Poughkeepsie, New York and some parts were produced at the company’s facility located in Endicott, New York. Description: Of the estimated six-million M1 carbines produced from 1941 to 1945, the 346,500 carbines made by IBM was a small percentage.
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