As of August 9th 2022 we won't be selling receiver flats or blanks to individuals.
It seems that the anti gun agenda has finally reached the point of going after the people that were making it way too easy to make a handgun from a kit and has caught us up in the middle of it. When I hear about the 20,000 guns supposedly found at crime scenes in the past few years and having never been contacted about any person that used an AK-47 in a crime by the ATF or homeland security then it really makes me wonder what the reality of their numbers are.
Anyway... the ATF isn't going to restrict the making of "Personal Built Firearms", they just want to make it more difficult. There are seveal hundred pages in the ruling that can be downloaded from the ATF website.
Main page of the ruling: https://www.atf.gov/rules-and-regulations/definition-frame-or-receiver
Document on the ATF website about the ruling. click here