The ZEV pro connector on average will deliver a 15% reduction in trigger pull weight from a stock Glock trigger. Compatible with all Glocks Gen 1-5 except for the G42 and G43. After 2 years of development and tens of thousands of rounds of testing, ZEV is proud to release the all-new PRO connector. Engineered to provide users with a consistent, positive reset and a reduction in trigger pull weight without sacrificing the reliability or safety of your pistol. Whether used in conjunction with a ZEV trigger or with your stock Glock trigger, the PRO connector will provide a noticeable increase in performance and is ready to drop-in and use straight from ZEV, no fitting or polishing required.