President Donald Trump's administration agreed to permit the sale and possession of devices that let gun enthusiasts convert semiautomatic rifles into weapons that can shoot as fast as machine guns.

The Five Best US Machine Guns Ever Produced: The United States military has produced some incredible machine guns throughout history, but worldwide, the machine gun has changed warfare forever.

The Trump administration has decided to permit the sale of devices that enable standard firearms to fire like machine guns, a move that one person familiar with the matter said was “by far the most ...