If ATF Comes A Knocking, Only Surrender Your 80% Frame or Receiver Under Protest!

The most important tidbit from the linked article (if this should happen to you):

...Inform them that the only ATF form you are willing to sign is an ATF 3400.23 – Receipt of Property and Other Items...
... because what they probably will offer (as opposed to an ATF 3400.23) is an ATF 3400.1 Form, Consent to Forfeiture or Destruction of Property and Waiver of Notice.



Obviously, you should never sign an ATF 3400.23, Ever. Period.