I frequently hear the uneducated (about Glocks, anyway) say that they have “no safety”. This is a completely inaccurate statement. And quite frankly, it aggravates me.
The Glock Safe Action Pistol, which I carry on and off duty has three very effective safety interlocks.
How safe? In the 10 years I have been carrying the Glock (Models 17 and 19), it has never ever fired without me pulling the trigger. The flip side to that is, it has ALWAYS fired when I did pull the trigger. From an officer safety viewpoint, that is the FOURTH safety.
From the website Glock Pistols – GLOCKMEISTER:
The Glock has no externally located safety devices which need to be activated manually. All of the safety devices function automatically. The devices are sequentially de-activated as the trigger is depressed (as the Glock is fired).
1. Trigger Safety:
This is incorporated into the trigger (26) in the form of a lever and in the untouched state it prevents the trigger from being moved rearward. If the weapon is dropped or if the trigger is subjected to an off center lateral pressure; the trigger will remain in the forward locked position. The trigger safety can only be released by pressure being applied directly to the lever on the trigger. This type of safety, in conjunction with the other two, offers a minimum fire ready time with a maximum level of safety for the user.
2. Firing pin safety:
In the secured position, the spring loaded firing pun safety plunger projects into the firing pin channel. This prevents the firing pin from moving forward, until the trigger is depressed.
3. Dropped gun Safety:
The firing pin pushes the trigger bar onto the safety ramp of the trigger mechanism housing under the power of the firing pinspring. This action places the left side extension of the trigger bar cruciform (the gun oriented with the muzzle down range) on the trigger mechanism housing ramp until the trigger is fully depressed. This safety prevents the trigger bar from releasing the firing pin without the trigger being depressed. If the trigger bar does not drop, the firing pin is not released.

The fact that Plaxico Burress shot himself with a Glock accidentally tells me one thing. He accidentally pulled the trigger. Glocks are simple weapons. Pull the trigger they go bang. Don’t pull the trigger and they won’t. PERIOD.