You may need to narrow down your question- in the case of M1 carbines marked Quality HMC, they were made by the Quality Hardware Manufacturing Company.
(OP here, narrowing it down here because of the silly policy of not allowing punctuation in questions... Basically, a gun range I occasionally visited in Durban runs courses, and their website lists various categories; Pistols, Shotguns, Rifles, HMC and so on. I'm wondering if it might be a local way of referring to SMGs or something.)
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