Wilson Heavy Duty Recoil Springs are made combat tough to repeatedly take a pounding yet show a remarkable consistent performance every time a round is fired. Keeping a fresh recoil spring in your gun will dramatically reduce the pounding your slide and frame receive. Drop-in.
In general, heavy loads need heavy springs and lighter loads need lighter springs. There is no hard and fast rule as to how much "Spring" a pistol needs. Too light a spring and the pistol opens and closes early and hard, increasing the felt recoil and battering the frame. Too heavy a spring and the slide is hard to open and may not cycle completely, jamming the pistol.
Shooters who are using +P ammunition or self defense ammunition will likely need heavier recoil springs. Shooters who are using target ammunition may be able to use lighter recoil springs.