The SI recoil spring for Glock pistols allows one to fine tune the timing and recoil characteristics of their Glock firearm. While the factory springs do work reliably with most ammunition, they do leave some things to be desired when it comes to handling characteristics, and they wear out over time requiring replacement. The reduced power springs also work great with lightened slides. Tune your Glock pistol for greater reliability and speed up follow up shots with an SI recoil spring. Mfg: Strike Industries
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