Agency Arms Drop-In Flat Trigger, 9MM/.40/.357, Black Finish, , Will Fits Glock Gen 1-4: G17, G17L, G19, G22, G23, G24, G26, G27, G31, G32, G33, G34, G35, G37, G38, G39, Will Not Fit Gen 5 DIT2-9-B High quality components and precise manufacturing make Agency Arms parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on.