.22 caliber adjustable pin probe with .25 caliber sleeve
Lighter valve return spring - allows valve to stay open longer
Two hammer weight spacers - allows more hammer spring compression and added hammer weight
.22 caliber velocity increases between 35-55 FPS
.25 caliber velocity increases between 50-80 FPS
**Per FX** This is considered a medium to difficult installation and should only be attempted by Impact owners that are comfortable working on their gun and have some good experience. Warranty will be voided. Please contact us directly for warranty installation.