This is a ZEV Technologies Kit known as the PRO, model SPR-STK-KIT-PRO.
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.
Features:
Heavy Trigger Spring
Reduced Power Firing Pin Spring
Reduced Power Firing Pin Safety Spring
Pro Connector
