Understanding how a trigger works is hardly complicated. A trigger is little more than a series of levers and springs. Safeties stand in the way of these levers. When you remove the impediment of the safety and pull back on the lever that is the trigger shoe, the machine springs into action. Yet there’s much more to the philosophy of a trigger—and any basic discussion of big-picture ideas begins with trigger pull weight (how much force is required to pull the trigger). When would you want a light trigger? Why would you want a heavier pull?