The mechanism works as follows: as the cartridge is chambered, the rear end of the bolt is pushed up into a recess, in a manner similar to tilting-bolt locked breech guns; but whereas such weapons rely on an additional mechanism to unlock them, in the case of the Reising the end of the bolt that pushes against the back wall of this recess, is subtly rounded, while the wall is correspondingly curved. On firing, the extreme pressure from the propellant gases is thereby able to force the bolt-end down, back to the horizontal. From here the bolt can move to the rear removing the cartridge from the chamber; but the combination of mechanical disadvantage and friction the force of the gases must overcome to push the end of the bolt down has achieved a delay of a fraction of a second, allowing pressure in the barrel to drop to a level sufficiently low for safe and efficient cartridge extraction.