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BE SURE TO CHECK OUT THE M1 FAMILY FORUM RULES AND DISCLAIMER HERE THANK YOU!

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Joined: Mon Feb 14, 2011 3:02 am
Posts: 781
Location: Bakersfield, CA
Favorite M1 Carbine Contractor: National Postal Meter

Post Posted: Wed Feb 16, 2011 11:47 pm 
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International Business Machine Corporation

-Main Manufacture and identification codes: "B"
-Main plant location: Poughkeepsie, NY.
-Average Cost to Government per completed rifle, $42.29
-Approximately 346,500 total Carbines were made by I.B.M. : About 5.7% of M1 Carbines made.

--M1 Carbines 346,500 (I.B.M., did not make the M2, M3, T3, or M1A1 Carbines)

-Serial number blocks assigned by the government:

--1st block, serial number: 3,651,520 - 4,009,999 | August, 1943 - May, 1944




-Primary stock & hand guard supplier: Rock-Ola, Jamestown Lounge, Lumb Woodworking, Sprague & Cartlton, and Milton Bradley.

-Barrel suppliers: I.B.M.

-Parts made directly by I.B.M.: Bolts, Receivers, Barrels and slides.

-Side notes:

--Many of there other parts were manufactured by other I.B.M. plants and suppliers.

--I.B.M. was the last contractor to get into carbine manufacture. They got up to speed within a month and did a great job of getting carbines out the factory.

--I.B.M. Figured out new manufacture techniques that reduced costs and were the first to develop a new rifling procedure that greatly increased barrel production.

-All matching vs 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. Just because its all matching doesn't necessary mean that is how it left the factory. 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. Sometimes marked or unmarked. 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. (most parts were shipped together in groups, magazine catches with sears, etc)

(Organized by year, 1943)

--Inland shipped approximately 10,000 bolts to I.B.M. in 1943.
--Inland shipped approximately 200 receivers to I.B.M. in 1943.
--Inland shipped approximately 27,000 slides to I.B.M. in 1943.
--NPM shipped approximately 1,000 trigger housings to I.B.M. in 1943.
--NPM shipped approximately 20,000 rear flip sights to I.B.M. in 1943.
--Underwood shipped approximately 14,000 sears to I.B.M. in 1943.
--Underwood shipped approximately 5,000 recoil plates to I.B.M. in 1943.
--Underwood shipped approximately 10,000 hammers to I.B.M. in 1943.


Example: You have an all matching I.B.M. carbine with a Inland slide, its possible it left the factory just like that.

Please feel free to PM me or post for any errors or any further information.

-Thanks.

-Some history of I.B.M.:

Here is a good site for info and history of I.B.M. http://en.wikipedia.org/wiki/Internatio ... s_Machines


-More info may be added.



***General Carbine history can be found here:****

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-General George S. Patton Jr.
"In my opinion, the M1 Rifle is the greatest battle implement ever devised."

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Joined: Fri Jan 10, 2014 4:35 am
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Favorite M1 Carbine Contractor: IBM

Post Posted: Sat Jan 11, 2014 4:28 am 
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Have an IBM carbine with A.O. stamped on the receiver. I understand that Auto Ordnance (AO) was a receiver subcontractor to IBM initially, but due to production problems at AO, IBM took over receiver production from them in late '43. Accordingly, some receivers may have the "A.O." stamp on the receiver below the s/n. Additionally, some receivers made by A.O. may have gone through an additional inspection by IBM during the "transitional" period when IBM took over production. These receivers may have a double-stamp serial number (A.O. s/n below the rear sight, IBM s/n above the sight). I have one of these "double-stamped" s/n IBM carbines.

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