Pedersen device

The Pedersen device was an optional attachment for the M1903 Springfield rifle that allowed it to fire a short 0.30 (7.62 mm) caliber intermediate cartridge in semi-automatic mode. This wonder weapon was developed to allow infantry to dramatically increase their rate of fire while on the move during World War I, while also allowing the rifle to be used in conventional bolt action mode for long-range fire from the trenches.