FILE - A bump stock is displayed in Harrisonburg, Va., on March 15, 2019. The Supreme Court has struck down a Trump-era ban on bump stocks, a gun accessory that allows semi-automatic weapons to fire rapidly like machine guns. , a gun accessory that allows semi-automatic weapons to fire rapidly like machine guns and was used in the deadliest mass shooting in modern U.S. history.
The Biden administration said that the Bureau of Alcohol, Tobacco, Firearms and Explosives made the right choice for the accessories that can allow weapons to fire at a rate of hundreds of rounds a minute. Justices from the court's liberal wing suggested it was "common sense" that anything capable of unleashing a "torrent of bullets" was a machine gun under federal law. Conservative justices, though, raised questions about why Congress had not acted to ban bump stocks, as well as the effects of the ATF changing its mind a decade after declaring the accessories legal.