Full Auto Glock 18!
Yes, Glock does make a full auto Model 18.
It is available to Law Enforcement and other "proper" authorities.
I have seen (and fired)a Glock 17 converted to "select fire".
Roger Loock at Revelation Arms has a select fire switch he has made and installed on a Glock 17.
Push the lever one way, and its a normal semi-auto, push it the other way and its full auto.
Again such a select fire switch is available for sale to law enforcement only, and of course anyone who has a Title II manufacturers license can build and posess such a device.
Its way cool....dumps a whole mag in about 1.5 seconds...kind of hard to keep the muzzle under control... but did I mention its way cool!!