On March 26, 2015, a Montana radio host, William Wolf, was arrested
by the FBI (not the BATF) in violation of 18 US Code §922 (o)
(o) (1) Except as provided in paragraph (2), it shall be unlawful for any person to transfer or possess a machinegun.
(2) This subsection does not apply with respect to—
(A) a transfer to or by, or possession by
or under the authority of, the United States or any department or
agency thereof or a State, or a department, agency, or political
subdivision thereof; or
(B) any lawful transfer or lawful possession of a machinegun that was
lawfully possessed before the date this subsection takes effect.
The “machine gun” in question may have been legal, until modified by the FBI, as explained in the
Criminal Complaint. So, let’s look at some of the information gleaned from the Complaint (underlining, mine):