Take your Shadow 2 or Shadow 1 from great to OMG! This will transform your S-2, delivering an ice crisp SA of 3 lbs. or less. DA typically runs 6 lbs. or less using our famous HS-12000 (11.5#) hammer spring. The disconnector will require minor fitting so you get the reset to a PERFECT 1 mm, which is not difficult to do with CGW tech support. Turns the CZ lock work into a precision Swiss watch! USPSA Production legal too!