
Trump banned bump stocks last December by executive action, and the new law is effective NOW.
Watch out, local gun nuts. President Donald Trump is coming for your guns.
Last December, President Trump issued an executive order banning bump stocks (pdf), devices that use the recoil energy generated from each shot of a semi-automatic rifle to increase the firearms’ rate of fire. The new rule amended the definition of “machine gun” to include bump stocks.
The ban went into effect three days ago, on March 26, 2019, exactly 90 days after it was published in the Federal Register.
On March 28, 2019 the U.S. Supreme Court refused an effort by gun nuts to block the ban, so Trump’s new rule is currently in full force, making anyone who owns a bump stock a felon.