ISMI Recoil Spring for Glock 17, 20, 21, 24, 31, 34, 35 20 lb Chrome Silicon

Replacement flat wire recoil spring. Some fitting may be required.Notes: Current production factory Glock springs are 16 pounds. Early, non-captive versions of the 17 and 17L have recoil springs of 19 pounds. Recoil springs fit over a pistol's guide rod and control how the pistol's slide functions. 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 c