I found this;
https://www.govtrack.us/congress/bills/115/s2475/text/is
But it doesn’t say anything about turning
them in.
From the bill:
(4)Paragraph (1) shall not apply to any lawful transfer or possession of a semiautomatic firearm described in paragraph (1)(C) that—
(A)was lawfully modified and possessed before the date of enactment of this subsection; and
(B)is registered in accordance with paragraph (2).
Ugh.
Looks like it covers binary triggers, too.
This’ll get shot down in court. I hope.