What are the “internal” safeties on a Glock?
Glock has 3 safeties:
1) Trigger safety (you all can see it in the midle of the trigger)
2) Drop safety(it is in the trigger mechanism housing)
3) Firing pin safety, better known as safety plunger (blocks the firing pin)
These 3 safety features is what is known as glock safe action, the only way a glock can fire is by pulling the trigger period, you can hammer with it, drop it, even be involved in a car accident and the inertia wouldn’t fire it!
I’ll take a picture of my glock cleaning mat in which is clearly explained with figures how the system works, these safeties engage secuentially during the travel of the trigger pull.
Glocks come standard with a 5 1/2 pound trigger pull weight, which is typically half as much for guns in double action mode. This is a striker fired system and is tantamount to being half cocked. The pull is the same for every shot.