Pretty sure LMG is the correct term, but I just say Machine Gun. Lot less confusing that way.
English
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It is called a heavy machine because it is a heavy weapon and it's a machine gun so hmg.
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Google says a HMG is used on vehicles and such, and LMG's are used by infantry.
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Sorry for the confusion but i was kidding. But then again Abraham Lincoln said that you can never trust the internet.
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