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Increasing the weight of your recoil spring is most common when reloading ammo above factory grade. It often takes trial and error to find the right combinaton of grain and spring weight. The Heavyweight Recoil Spring Kit comes with 20, 22, and 24 pound springs.
This kit is meant to work on recoil rods for the following GLOCK models: 17, 20, 21, 22, 24, 31, 34, 35.
A recoil rod is not included with this kit. ISMI springs function best with Glockmeister stainless steel or tungsten rods. These springs are not to be used on GLOCK plastic rods.
Malfunction is possible when using too heavy or too light of a recoil spring.