While the ATF CFR says, "Machine gun. Any weapon which shoots, is designed to shoot, or can be readily restored to shoot, automatically more than one shot, without manual reloading, by a single function of the trigger. The term shall also include the frame or receiver of any such weapon, any part designed and intended solely and exclusively, or combination of parts designed and intended, for use in converting a weapon into a machine gun, and any combination of parts from which a machine gun can be assembled if such parts are in the possession or under the control of a person," you're correct that it does not differentiate between the types of "automatic" or types of "machine guns." You and I will have objectively different meanings for some things, but personally, I have never ever in my service in the Marines seen what I would consider a fully automatic M16/M4. Nor have i ever heard of them referred to as that. I carried an A2 for 2 years, an A4 for about 2 years, and an M4 for 3 years. You would have to modify it for it to be what I would say is "fully automatic", i.e. firing continually while depressing and holding the trigger until the need to reload, a stoppage occurs, or until you willfully release your finger off the trigger. I have never heard of an M16 or M4 be referred to as an "Automatic". Nor would i consider a burst weapon to be "fully automatic". It has only been to described as a semi-auto and burst weapon. Never fully automatic. What has always been referred to as a a fully automatic and an actual machine gun, have even exactly what I would consider a machine gun, with the definition I stated before, i.e. SAW, 240, .50, M60 and MK19 (withholding machine gun w/AUTOMATIC grenad launcher instead."
Anyway...that being said, that's just my opinion despite what the CFR definition is. I think it's wrong and we're just nit picking at terms, so it doesn't really matter much whether we agree or not. Take care man.
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