ZEV Technologies Pro Trigger is built from the ground up to perform better and more reliably than anything else on the market. At its core is a proprietary trigger bar and professional connector. This Ultimate model has a flat face riveted trigger and black housing and red safety. It is compatible with G17/G19/G26/G34 Gen4. Included is a trigger bar, Pro connector, firing pin safety and spring, Pro striker spring, skeletonized striker, trigger spring, and ejector housing.