The JP trigger system is compatible with your original hammer if it has not been altered.
Note: If you are ordering for an Armalite AR10 or Knights SR25, Bushmaster 308, DPMS LR-308 or using your rifle for tactical or cold weather operation, specify the JPS40 tactical spring kit with your order. In these rifles, a heavy hammer spring is necessary for ignition reliability and to eliminate the finger bounce "doubling" possibility.
Available in either .154 (Standard Mil-Spec) or .169 (Colt design)
Select pin size below.