WASHINGTON DC, he U.S. The Supreme Court on Friday struck down a federal ban on "bump stock" devices that accelerate the firing of semi-automatic weapons like machine guns, slapping new gun restrictions - this time an introduced bill under Republican former President Donald Trump. The justices, in a 6-3 decision penned by conservative Justice Clarence Thomas, upheld a lower court ruling with Michael Cargill, a gun store owner and gun rights advocate from Austin, Texas, challenging the ban by claiming that the US. bi company misinterpreted a state law banning machine guns as extending to bump stocks. The conservative justices were in the general public, and the liberal justices dissented.