[ELI5] How is an SMG a machine gun and an auto-rifle isn’t?

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SMGs of course are “submachineguns” because they’re generally full auto like other machine guns, despite firing pistol-caliber cartridges. However, my question is, why are “automatic rifles” not simply called a different form of machine gun? Surely every SMG and LMG isn’t smoothbore right? Why aren’t “assault rifles” just called “intermediate machine guns” or something of the sort when they’re fully automatic just like SMGs?

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Anonymous 0 Comments

AR’s are not designed for sustained automatic fire. They are select-fire and intended to be used largely in single-shot.

SMG’s, LMG’s, MMG’s, and HMG’s are all intended to be used almost exclusively in automatic mode.

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