JP Tactical Trigger Spring Kit - Grey 4.0 lb.
The Tactical (Grey) Hammer Spring Kit with Yellow Trigger Spring will yield a 4.0 - 4.5 lb. pull weight if used with JP trigger components. If you get the JP EZ trigger and want the Grey 4.0 lb. Hammer Spring for absolute primer ignition reliability even with foreign ammo and hard NATO primers, this is the spring kit for you. This is also a good idea for those running a JP trigger with a 9mm upper.