The apex m&p competition action enhancement kit was designed for the action shooting sports competitor.This drop-in kit will reduce trigger weight by approximately 4.0 lbs.(based on a starting trigger pull weight of 7.0 to 8.0 lbs.).The competition striker spring and trigger return spring are shot-peened to extend service life.The kit is engineered to be drop-in and should not require further gunsmithing (however, armorer or gunsmith installation is recommended).The m&p competition action enhancement kit is perfect for use with the m&p already equipped with the apex polymer or aluminum action enhancement trigger.Model: Enhancement KitMaterial: Metal