ZEV Technologies Competition Spring Kit Single Unit. These Pistol Parts from the innovators at ZEV Technologies feature a two-pound striker spring that is heavier than traditional models for a better trigger pull. Thanks to the firing safety pin the ZEV Technologies Competition Spring Kit Pack reduces power for better recoil and blowback. Get a lighter and smoother trigger pull with the ZEV Technologies Individual Spring Kit. Specifications for ZEV Technologies Competition Spring Kit: Manufacturer: ZEV Technologies Color: Bronze Fabric/Material: Aluminum Gun Make: Glock Gun Model: All Glock Gen 1-4 except Glock 42 Glock 44 Quantity: 1 Pack Features of ZEV Technologies Trigger Spring Kit 1UZ-FSP-CMPSP two pound Striker spring Firing Pin safety spring Trigger spring Package Contents: ZEV Technologies Competition Spring Kit Striker spring Firing Pin Safety Spring Trigger Spring What firearm models does the manufacturer say ZEV Technologies Competition Spring Kit is compatible with? The manufacturer suggests that ZEV Technologies Competition Spring Kit is compatible with All Glock Gen 1-4 except Glock 42 Glock 44ZEV Technologies SPR-KIT: Competition Spring Kit Single Unit