Nope, he still had to pull the trigger once per round. Still semi-automatic fire, a bump stock makes that trigger pulling faster but it does not make it automatic fire.
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What is the argument for keeping bump stocks legal? It's not like you would use them for hunting.
That's the extremely narrow definition of automatic that's in the books. Do you think automatic weapons are heavily regulated because of their feeding system or because of their rate of fire?
I've fired both autos and bumpfire, the rate of fire is similar enough to be identical, at least depending on the manufacturer.