Here we go. Litigation to ban bump fire and "ROF enhancing accessories".
https://www.feinstein.senate.gov/public/_cache/files/a/7/a7493ca2-0cd7-416a-8d1f-929d89e71572/0141802AFBB99AC5EA299D5B71B98A52.automatic-gunfire-prevention-act.pdf
I'm not sure but I do know it's very depressing that it took that long. That and I'm disappointed that I still don't know what stock I want to put on my M92 PAP.