These firing pins are made with an aluminum alloy shaft that is permanently bonded to a steel firing pin point. The lighter weight reduces lock time by approximately 40%. Assemblies include a firing pin, firing pin spring, bolt shroud and cocking piece. Notes: This firing pin assembly has a T-6 aluminum bolt shroud that is 60% lighter than the factory shroud. The firing pin assembly includes an extra power firing pin spring and a firing pin with a lightweight body and steel tip that greatly reduces lock time Remington's Integrated Security System has a J-shaped slot in a button that protrudes from the left rear of the bolt. A key inserts into the slot to turn the button and lock the action open.