Thanks for the video.. almost like the SR9 extractor.
Stole this from the Glock website:
TRIGGER SAFETY
As the first of the three Glock “Safe Action” safety features, the trigger safety prevents inadvertent firing by lateral forces on the trigger. Releasing the trigger will automatically reactivate the safety.
FIRING PIN SAFETY
The Glock firing pin safety is a solid hardened steel pin which, in the secured state, blocks the firing pin channel, rendering the igniting of a chambered cartridge by the firing pin impossible. The firing pin safety is only pushed upward to release the firing pin for firing when the trigger is pulled and the safety is pushed up through the backward movement of the trigger bar. Releasing the trigger will automatically reactivate the firing pin safety.
DROP SAFETY
In the line of duty it may happen that a loaded pistol is dropped on the floor. Contrary to conventional pistols, the Glock drop safety prevents unintentional firing of a shot through hard impact. When the trigger is pulled, the trigger bar is guided in a precision safety ramp. The trigger bar is deflected from this ramp only in the moment the shot is triggered.
Stay away from XD!! :P