After the success of the Glock 17 in Austrian military trials, the company chose two specific markets to target for expansion. One was competition shooters, for whom the Glock 17L was released. The other was the international law enforcement and military market, for whom they decided to make a machine pistol - the Glock 18. The 18 was released in 1986, a model identical to the 17 except for the addition of a rotary selector switch on the slide.

In response to complaints about the controllability of the Glock 18, the 18C (Compensated) was released in 1996. This was a new model which added four barrel ports and a lightened slide to the 18. Neither has ever been really successful simply because machine pistols are by their very nature now very practical.

The question we are going to look at today is how the Glock 18 system works. As one would expect from Glock, it is a quite simply mechanical change to the semiauto lockwork.