Prior to the US entry into World War II, John Pederesn, a long time employee of Remington Arms, came up with a devide to modify a 1903 Springfield rifle to work as a semi-auto.
If you go looking for a Pedersen device, they will be on the shelf next to the hen's teeth. I've never seen one, but it is an extremely interring part of American firearms history and deserves to be remembered.
Mark has one in his shop. Let's go down the rabbit hole with him.