Strike Industries 13 lb Reduced Power Recoil Spring for Glock Black One Size. 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. Specifications for Strike Industries Reduced Power Recoil Spring for Glock: Manufacturer: Strike Industries Color: Black Fabric/Material: 17-7ph Stainles Steel Gun Make: Glock Condition: New Features of Strike Industries Reduced Power Recoil Spring for Glock Wound from flat wire for reliability and longevity 177ph stainless steel resists corrosion and lasts much longer than factory carbon steel springs. Available in 5 different spring weights Package Contents: Strike Industries Reduced Power Recoil Spring for Glock 1x recoil spring Strike Industries SI-G-RPS-13: 13 lb Reduced Power Recoil Spring for Glock Black One Size