The Pedersen device- semi-automatic 1903 Springfield conversion| Unicorn Guns with Jerry Miculek
The Pedersen device, a rare WWI-era conversion, transformed the bolt-action 1903 Springfield into a semi-automatic rifle using a .30 caliber pistol cartridge. Designed by John Pedersen for trench warfare, it featured a 40-round magazine and a high rate of fire. The conversion process involved swapping the bolt for the device and was a top-secret project with few surviving examples.









