This is a ZEV Technologies Trigger known as the PRO Ultimate, model FFT-PRO-ULT-3G9-B-B.
ZEV created the market for high end GLOCK upgrade parts and continues to offer the most extensive catalogue. From their renown triggers" slides and barrels to the smallest of springs" if you are a serious shooter ZEV has your upgrade. All ZEV Products are proudly made in the USA.
Crisp Clean Trigger Pull
Most Reliable Replacement Trigger On the Market