The ruling on ATF Definition of ‘Frame or Receiver’ and Identification of Firearms still has not hit the registry yet. That means the 120-time frame is still not in effect.
However, the rules, definitions, and amendments themselves are on ATF.Gov/firearms/docs.
Definition of “Frame or Receiver” and Identification of Firearms
However, the rules, definitions, and amendments themselves are on ATF.Gov/firearms/docs.
Definition of “Frame or Receiver” and Identification of Firearms