A drop in, complete assembly trigger Pull weight 2.5 - 3 pounds for both curved and straight shoe models The trigger makes use of your rifle's original hammer/trigger pins as well as safety Offered in straight or curved trigger shoe This Timney set the standard for aftermarket trigger upgrades for the AR/M4 rifle No gunsmith needed, easy to install Ready for the range, no adjustments needed No additional parts needed to install trigger Trigger shoe options to fit your feel/style Trigger allows you to become more accurate with your rifle