The trigger safety and the trigger must be fully depressed at the same time to fire the pistol. If the trigger safety is not depressed, the trigger will not move rearward and allow the pistol to fire.
The trigger safety is designed to protect against firing, if the pistol is dropped or the trigger is subjected to lateral pressure. Firing pin safety The firing pin safety mechanically blocks the firing pin from moving forward in the ready-to-fire condition. Most "gunwriters" do not truly understand this safety, or if they do, they do not seek to explain it fully. Everyone knows that inertia can fire a pistol dropped on its muzzle if the firing pin is not secured by a safety be it manual or a firing pin block e.
Personal opinion on the G18 is that it is a waste. Military would use a rifle for automatic firing, and law enforcement would never use the G18, full auto from a handgun would likely hit a non-intended target. All three pistol safeties automatically re-engage when you release the trigger to its forward position. How Does it Work? Trigger Safety The trigger safety is the first safety in the firing sequence.
Firing Pin Safety The second safety, the firing pin safety, mechanically blocks the firing pin from moving forward in the ready-to-fire condition.
Drop Safety The final safety involves the trigger bar, which rests on the safety ramp within the trigger mechanism housing. Only at extreme, unrealistic angles would an object not engage the safety. Which is probably why we constantly hear of Glocks going off as they are put into holsters. The distance of the safety to the frame has been calculated so that if the trigger were to move rearward, the trigger safety would contact the frame before the cruciform was clear of the drop safety shelf.
The second safety to be deactivated is the firing pin safety. This is commonly referred to as the plunger or firing pin block. The firing pin safety is a small cylindrical part that internally blocks the forward movement of the firing pin until the trigger is pulled. This safety is automatically deactivated by the vertical extension on the trigger bar as the trigger is pulled. As the firing pin safety retracts into the slide cavity, it allows the firing pin to move freely past it.
The third safety is the drop safety. This is a molded area of the trigger housing that the trigger bar rides in. It physically prevents the trigger bar from dropping down until the trigger has been fully depressed.
The timing of all three of these safeties is critical to the correct functioning and inherit safety of the Glock Safe Action System. Most shooters believe eliminating pre-travel is what makes a Glock trigger feel better. This is partially correct as removing pre-travel will give a shorter pull. Probably not. It is important to realize that when you remove pre-travel, you also mechanically stage the trigger farther rearward. This causes the firing pin safety to be partially deactivated and moves the cruciform dangerously close to the edge of the drop safety shelf.
As mentioned earlier, as pre-travel is removed from the system, the cruciform gets closer to the edge of the drop safety shelf. At this point real engineering needs to be performed to calculate the correct distance between the inside of the trigger guard and the distance to the safety.
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