. On Friday the justices said they will review a Trump-era ban on bump stocks, a device the ATF says converts a semi-automatic weapon into a machine gun by firing multiple rounds with a single pull on the trigger. Machine guns have been banned under federal law since 1934.
Prior to the shooting, the ATF had not classified bump stocks as illegal, but the shooting prompted a re-evaluation of how the devices work, and the agency ultimately banned them as illegal because a single pull of the finger causes the firing of multiple rounds; the ATF said the devices converted legal guns, like the semi-automatic AR-15, into illegal machine guns.The rule went into effect in 2019 after the Supreme Court declined to block it.