![]() ![]() Barrels made by the company before 1944 were dated while later barrels were not marked with a date. One of the major parts manufactured in-house by IBM was the barrel, marked with the letters IBM. Receivers made by IBM had the narrow type of tang while those produced by subcontractor Auto- Ordnance had a wider tang. IBM carbine receivers used the integral spring guide design. During rebuild programs the weapons were upgraded with the latest parts, like the adjustable rear sight and barrel band with the bayonet lug. ![]() World War II era weapons were rebuilt at least once and often a number of times. After contracts were terminated, huge surpluses of spare parts were collected and used for refurbishing or repairing unserviceable weapons. However, it was during Ordnance Department rebuild programs where the mixture of different contractor parts generally occurred. Therefore, it would be possible to have mixed contractor parts in a gun and still technically be correct. Approximately fifty-percent of the receivers used in the assembly of IBM carbines were made by the Auto-Ordnance Corporation of Thompson submachine gun fame.ĭuring World War II production runs of all weapons, shortages of parts often occurred resulting in parts being obtained from surpluses at other contractor’s plants to keep the production lines moving. 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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