The Pedersen rifle, known officially in its final form as the T1E3, was a semi-automatic rifle designed by John Pedersen and made in small numbers for testing by the U.S. Army in the 1920s as part of a program to standardize and adopt a replacement for the M1903 Springfield.
It ultimately lost out to the M1 Garand.
The Pedersen uses a toggle lock mechanism similar to the Luger pistol. It is semi auto only. The magazine holds 10 rounds and is fed from an en-bloc clip. It features a safety which will prevent the weapon from firing when engaged. When the magazine is empty, the bolt locks open and the en-bloc clip ejects from the rifle.