The Supreme Court on Wednesday will hear a case surrounding whether the federal government can ban attachments known as bump stocks that allow semi-automatic rifles to shoot quicker — and whether those attachments bring the firearm within the definition of a machine gun.

Michael Cargill, owner of Central Texas Gun Works, handed over his bump stocks after the Bureau of Alcohol, Tobacco, Firearms, and Explosives banned them in 2018. The ban followed the Oct. 1, 2017, massacre on the Las Vegas strip that killed 60 people when 64-year-old Stephen Paddock used such attachments while firing down at civilians from the 32nd floor of a hotel.