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The ZEV Technologies Competition Spring Kit contains a heavy trigger spring (heavier is better, as it assists with trigger pull), A reduced power firing pin spring, and a reduced power firing pin safety spring.
The result is the lighter and smoother trigger pull for your GLOCK. When used in conjunction with the ZEV Technologies V4 Race Connector(CONN-V4-RACE), the trigger pull weight is reduced down to a smooth 3 lbs total.
A ZEV spring kit comes with one of each of the followin, a two pound Striker spring, Firing Pin safety spring, & Trigger spring