Crosman "2300S" Style Rear Velocity Adjuster for the 2240, 2250, 2260 and Discovery.
Lockscrew for the adjustment bolt will keep your selected setting in place until you decide to change it- no creeping or movement is possible with this unit.
The rear velocity adjuster replaces the rear cap on Crosman 22xx Series or Discovery (Co2 powered) guns. It adjusts velocity up or down by adjusting the tension on the hammer spring- allowing a lighter or harder hit on the valve pin, decreasing or increasing power output.
Replacement hammer spring included.