Armaspec Safety Plunger with Reduced Spring, For Glock Gen2/3/4, Silver ARM431-RS Armaspec's High-Performance Safety Plunger is precision-machined out of hardened stainless steel" with a subtly rounded surface to minimize friction and smooth out the action compared to the factory component. This results in reduced drag on the trigger bar as it moves over the safety plunger when you pull the trigger" making it easier to engage the trigger with less effort.