So says another ignorant poster on FR. Where's your evidence to back up such a claim? I can offer one to go to the many various websites of which there are many that deal in these type of devices of which 'bump stocks' is only one of the different style devices made and sold for this very purpose and see their posted numbers being made and sold. Each major company reports them being sold to be in the thousands and even hundreds of thousands with many routinely on back order for weeks at a time. Seems that at least someone must be buying them. Maybe it's the Russians?
Tell me what practical use a bump stock serves.