Has anyone tried the Konceptus tuning kit in their Lucznik Predum. I don't own the Predom myself due to the horrible firing behaviour but had a club member bring one along with this kit installed this morning.
Completely transformed the gun.
The inner mainspring is dispensed with altogether and the outer mainspring replaced with one of stronger wire.
It means the gun runs on the one mainspring which allows correct delrin guide rod and top hat to be fitted (incl. in the kit)
The result is a complete transformation. The boing and vibration of the twin spring arrangement is turned into a dull thud with no vibration and halved group sizes. The pellets are also leaving at higher velocity at almost 450fps for Hobby.