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IBM made M1 carbines (short rifles) for the war. They are very collectable now among gun/computer nerds.

There's also the 1911 pistols made by Remington Rand and Singer: https://en.wikipedia.org/wiki/M1911_pistol#World_War_II

I was actually issued a Singer manufactured .45 in the US Army in 1990. It still fired just fine.

We switched to 9mm not too long after though.