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That is an important message but one, I'm afraid will fall on deaf ears.

An automatic weapon is a weapon that fires more than one round with a single pull of the trigger.
A sub-machine gun is an automatic weapon that fires a pistol round, hence the "sub-" part of it.
A machine gun is an automatic weapon that fires a rifle round or larger round (like the Ma-Deuce).
(IANAGA).

I know that such distinctions would also be useless to a reporter trying to get the story in print before anyone else.