I know there are some gun shops that are suing as well, but I have not heard of any state legal action.
I suspect that is because this stupid law is toothless, since FFL sales are already reported via the NICS check.
Still, I would like to see a legal response from the states to protest border states being singled out for state specific federal restrictions.
IMHO, the regulation was primarily to set the precedent for national registration. The BATF is already maintaining a national database of information on the forms that are required when two handguns are sold to an individual within a week. This data base is claimed to be “grandfathered” into current law and not subject to the congressional ban on a national registration database.
Adding a reporting requirement for semiautomatic rifles is a logical step in the process to expand the existing database and erode congressional support for the ban on national registration.