Trying to figure out why bumpstocks are even a focus. I can only imagine it is to prevent them being carried by violent leftist groups, for use in street rioting or protest group confrontations.
AFAIK, no trained gun owner uses a bumpstock or has any purpose for one, and it causes such inaccurate aim that it would only be useful for allowing an untrained person with a semi-auto to wildly fire as many rounds as possible into a group of people. And a legit gun owner with no criminal record is already able to lawfully obtain a real automatic rifle anyway, by going through the proper paperwork in states where it is allowed.