(Francisco Kjolseth | The Salt Lake Tribune) Utah gun rights advocate Clark Aposhian, one of only a handful of Americans who are legally allowed to keep their bump stock, a shooting accessory that alters semi-automatic rifles to fire in quick bursts like a machine gun, demonstrates how it works on an AKM-47 at a gun range in Murray, UT, on Thursday, April 4, 2019. He is challenging the bump stock ban in court, and an appeals court has allowed him to keep his bump stock until his case is resolved in court.