Requires minor fitting. Patented Trigger Control Tab (TCT) is shortened. No changes are made to the pistol. TCT works by eliminating over-travel. Shortens the total length of trigger pull and reset enabling you to shoot faster and better. Self-cleaning holes remove debris from the trigger mechanism insuring that no matter what gets in the holes it gets out. Pre-polished for a consistently smooth surface. Kit contains one trigger, one orange armorer's plate, one armorer's tool and three springs (6 pieces total).