I already own several. The ATF has never visited me. Once they’re stripped out of the NFA list of restricted items, they will be regulated like firearms. Your NICS check will be the closest thing to a visit from the government that you will ever have to worry about provided you are a law abiding citizen.
This is exactly what has stopped me from going the SBR/Silencer route.
This guys swears these spooks will visit you to “check up” on your NFA item and if it’s not there you’d better have a good lawyer.