The ATF appears to have played with the definition of "readily" to include more.
https://www.atf.gov/file/154586/download
Justice Department Proposes Rule to Curb Spread of ‘Ghost Guns’DEPARTMENT OF JUSTICE
Bureau of Alcohol, Tobacco, Firearms, and Explosives
27 CFR Parts 478 and 479
Docket No. ATF 2021R-05; AG Order No. 5051-2021
RIN 1140-AA54
Definition of “Frame or Receiver” and Identification of Firearms
AGENCY: Bureau of Alcohol, Tobacco, Firearms, and Explosives, Department of
Justice.
ACTION: Notice of proposed rulemaking; request for comment.
SUMMARY: The Department of Justice (“Department”) proposes amending Bureau of
Alcohol, Tobacco, Firearms, and Explosives (“ATF”) regulations to provide new
regulatory definitions of “firearm frame or receiver” and “frame or receiver” because the
current regulations fail to capture the full meaning of those terms. The Department also
proposes amending ATF’s definitions of “firearm” and “gunsmith” to clarify the meaning
of those terms, and to provide definitions of terms such as “complete weapon,” “complete
muffler or silencer device,” “privately made firearm,” and “readily” for purposes of
clarity given advancements in firearms technology. Further, the Department proposes
amendments to ATF’s regulations on marking and recordkeeping that are necessary to
implement these new or amended definitions.
Note "potential crime scenes" and the lack of distinguishing between home-built firearms and manufactured firearms with defaced serial numbers.More than 23,000 firearms without serial numbers were recovered by law enforcement from potential crime scenes from 2016 through 2020, the Justice Department said.
“This proposed rule would help keep guns out of the wrong hands and make it easier for law enforcement to trace guns used to commit violent crimes, while protecting the rights of law-abiding Americans,” Attorney General Merrick B. Garland said in a written statement.
90 days to comment.As proposed, the rule also would require retailers to run background checks before selling at-home assembly kits for ghost guns.