Tuning FX Wildcat MKII caliber swap

I know that you cannot go bigger unless you get a barrel assembly and supporting hardware. For example with my impact compact in .22 I initially though I could just do liner probe and magazine, then I measured the end of my barrel.... It was less than. .25 so no.... Can't go bigger without more items. Maybe smaller but not bigger.
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So yes if you have the proper hardware, like a barrel swap assembly, probe, magazine. But not with just a liner, probe, and magazine in my scenario. 



The impacts are like small block chevy engines of the pcp world.
 
Whether this is accurate or not, I recall reading Airgun Depot's 'Guide' on the WC Mk2 when I was initially researching these guns. They specify within this guide (my emphasis added):

"Perhaps the most exciting new feature of the Wildcat MKII is the FX Interchangeable Barrel System. ... Note that you can't change the caliber by changing the barrel liner, just twist rates...."

Airgun Depot WC MkII Guide