I agree completely it's one shot per trigger pull. But those shots are very, very close together and those most devoid of a moral compass, the lowest-bred, most mentally deranged and intellectually-challenged among us here in New York happen to be in our state legislature. (Hey, what other job could they possibly hold down?) They would instantly and unquestionably regard a bump-fired rifle and a machine gun as exactly the same thing...facts, logic and mechanics be damned.
I sure don't trust the law here not to swoop down on someone who cleared a mag quickly with this technique.