Since I am a Glock guy, I can tell you that the empty chamber indicator is clearly visible.
Notice the trigger has nowhere to move?
This only happens when the trigger is pulled on an empty chamber and the action is not cycled.
Probably the biggest safety feature that nobody knows about unless they read the book.
And you can tell that the gun cannot possibly fire, as-is, from 10 feet away. *This only applies to Glocks.