The Glock, unlike most centerfire handguns, does not have a hammer which is dropped to push a firing pin when the trigger is pulled. Instead, the Glock has a striker which is completely enclosed within the slide. Whenever a round is in the chamber, the striker is partially retracted under tension. There isn't enough tension to fire the gun if for some reason the striker were forced forward from this position.So should you be worried? No. If you still have your doubts buy some blanks, load one up, and throw it around.Three Safeties
Glocks have three safeties: the trigger safety, the firing pin safety, and the drop safety. The safeties are redundant, keeping the Glock from discharging at any time unless the shooter pulls the trigger.
The trigger safety is a small button on the face of the trigger which keeps the trigger from moving backwards (and thus firing the weapon) unless pressed straight back during a normal pull. This helps keep the trigger from moving backwards when dropped or if something gets in the trigger guard.
The firing pin safety is a small device in the slide of the gun which blocks the striker from moving forward. This device is moved out of the way automatically when the trigger is pulled. So unless the trigger is pulled, there is no way the firing pin can strike the primer on a chambered round.
The drop safety is part of the trigger housing inside the receiver. It is a small "shelf" which a part of the trigger mechanism called the cruciform must overcome in order for the striker to release. Therefore, even if the trigger safety and firing pin safety malfunction and the gun is dropped, it cannot go off.