M1 Carbine IBM "AO" Receiver Question

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Acquired a very clean IBM carbine a year or so ago, purchased it from a lady who said it belonged to her father. She said he was with the Navy in (or immediately after) WWII, Sea-bees if I recall. She gave me a lot of history about her Dad but nothing to document the provenance of this carbine. That being said, I don't really know if he brought it home with him after his tour or if he acquired it afterwards.

The rifle is in excellent condition, with an IBM barrel (10-43) and a type III barrel band (which makes me think it was an arsenal rebuild during the war). S/N is in the 3852xxx range (1st series?) but I have not "dissected" it yet to check all the internal parts as to manufacture.

My question is regarding the receiver. Behind the rear sight, it is stamped IBM CORP. with the serial number below, and the letters A.O. (Auto Ordnance) stamped below it, indicating a receiver made by A.O. for IBM. However, this carbine also has IBM CORP and the same serial number stamped in front of the rear sight! Basically, it's a double-stamped receiver. I've never seen or read anything about this before, was wondering if any of you experts can tell me more about it. I'm thinking this was probably done when IBM took over receiver production from Auto Ordnance, and perhaps utilized whatever receivers were already made by A.O. and then re-stamped them with IBM. Does this make this any more rare (or valuable) than other A.O. stamped receivers?

Appreciate any and all info on this carbine.

Thanks, --728shooter

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