As a true fully automatic pistol the G18 is one of the most specialized GLOCK pistols. With an external fire selector at the rear of the slide, you can switch from semi-automatic to full-automatic firing mode.

It comes with an extended 19 round magazine and can provide greater firepower with the optional 33-round magazine. The rate of fire in full-automatic mode is approximately 20 rounds per second.

Released in 1987 the pistol has the same characteristics as other previous models and the frame size of the service pistol classic G17.