FX Wildcat MKII .25 cylinder and barrel knock

I recently purchased a new Wildcat MK2 in .25 and it’s a great gun but sometimes the barrel and cylinder will knock together, usually when I move the the gun up or down rapidly.

Is this normal?

And does anyone have any tips on how I could fix this? I was thinking of putting something between the barrel and the air cylinder but don’t want it to look cheap, if that makes sense?
 
How big is the LCD (if any) hanging off on the shroud? I've used spacers between bottle/shroud before... Kinda defeats the 'fully floated' barrel concept. I know the WC's barrel is not FULLY floated but still. May help, may introduce some poi shift as tube pressure changes. Some of the spacers I've used in the past have been as simple as a an inch of electrical tape rolled into a tube and squeezed between the shroud and tube.

Make sure the shroud is on tight and the screws in the barrel/tube/trigger support structure are tight (dont over torque them) before making other changes.

I haven't had a full size WC in a while but I remember the same thing but it was never a problem.