On a Striker Fired system the striker, specifically the lug face surface, determines half of your break feel. Another major consideration are the shelves that interface with the safety plunger. Both of these areas are highly susceptible to drag thereby compromising the brake feel and function. This Striker is performance enhanced which means the Lug face surface and the shelf ledges are de-tooled, refaced, honed to 30,000 grit then high polished to eliminate any drag in the system. It also comes as a full assembly w/cups, spring, and spacer. This striker assembly paired with the proprietary changes made to the Seer of the EVOLUTION X kits addresses all interfacing surfaces of the striker firing system in complete totality. This upgrade in almost all cases drops the break weight by 1/4 lb.