What Is Glock Trigger Stacking?
The edge of the sear does NOT return to the exact same spot it was in, higher up, on the striker lug before either light, or repeated pressure was applied to the trigger, and/or trigger bar.
This is the reason, ‘Why’ the sear’s, ‘kick plate’ angle has been changed on new 4th generation, and current 3rd generation Glock trigger bars.
It is, also, the reason, ‘Why’ newer Glock pistols require dot (‘.’) connectors in order to duplicate the lighter feel of earlier 3rd generation Glocks.
ADVISORY: I am NOT a Certified Glock Armorer! (I'm only that armorer which Gaston Glock has forced me to become.)