Luger P08 or Parabellum Pistole is semi automatic pistol, recoil operated. Luger was an evolution of the 1893 Hugo Borchardt design C-93. Luger is used by army of German during World War 1 and World War 2. Luger was design by Georg J. Luger in 1898.
The Luger uses a toggle-lock action, which utilizes a jointed arm to lock. The barrel and toggle assembly travel roughly one-half inch rearward after a round is fired. After moving rearward, the toggle strikes a cam built into the frame, causing the knee joint to hinge and the toggle and breech assembly to unlock. At this point the barrel stops its rearward movement, but the toggle and breech assembly continue moving due to momentum, extracting the spent casing from the chamber and ejecting it. The toggle and breech assembly subsequently travel forward and the next round from the magazine is loaded into the chamber. The entire sequence occurs in a fraction of a second.