The trigger itself is merely a lever. The greater the mass of the trigger, the more likely that a drop onto the floor (as shown in the many videos) would result in an uncommanded firing. The mass of the trigger wants to remain in motion once the pistol itself ceases falling upon impact with a hard surface (floor), and the more mass the trigger has, the greater likelihood that the uncommanded firing will occur. It's all a delicate balance between trigger mass and trigger pull weight. The lighter the trigger pull weight of the pistol (and the P320 is reputed to have a nice, light trigger pull), the less mass the trigger itself can be in order to prevent an uncommanded firing. Physics works.Not sure I am understanding your statement. Are I saying that a heavier weight (mass for the piece of aluminum) trigger also stops the ND? If so then the issue isn't the inertia of the trigger causing the movement required to fire. It's been a while since I've taken physics, but if memory serves correct inertia is a function of mass. More mass = more inertia = more movement. Only way to change that and keep trigger pull the same (same springs) is to decrease mass.