I was looking into fitting a 4mm hard rubber buffer, from a tap rebuild kit, inside the piston between the head and thrust bearing plates on my CFX, if I ever get allowed the time to get on with it , with a 1mm softer rubber washer, a seal from a washing machine feed hose, inbetween the preload spacer and the spring guide, as they are ironically the correct diameters.
My theory being it will reduce felt recoil/vibration from the spring as it crashes around inside the gun/piston, I wont know whether it works until its back together though.
I doubt it will have the same feel as a piston head damper, possibly even less than the amount your saying you can feel.... we shall see.....
ATB
Sean
Slowly morphing into an RWS/Diana/Original fanboy.
Definitely a springer fanboy.