I have been looking at the options, and really to me it seem like the barrel swap ability is worth next to nothing.
For instance i have a 600 mm Maverick in .177, if i want to upgrade that to a .22 i would need everything but the pipe that hold all the stuff together as it is my understanding the .22 barrel is 8 mm Od VS the 7 mm of my .177 barrel, so i will need everything in the breech end and muzzle end + of course probe ASO, which really is a entire new barrel.
So in my perspective why not just sell complete systems ( caliber / length ). And not forgetting the problem of actually finding the parts you need in stock anywhere.
As it is "lego" style it do get rather expensive to upgrade caliber,,,, but of course so is buying a #2 gun in that caliber.
Personally wanting a .22 too when i can get a permit for that, i think i will prefer to buy a #2 weapon instead, CUZ if i was to sell, if the buyer dont have permit i would just be able to sell my stock .177 Maverick to him, and if i had gone that way i would be left with a almost complete .22 kit, that i would probably have the best chance of ever selling internationally, and even then the loss would probably be significant.
Of course me being a Dane in itself mean a range of hoops that must be jumped or accounted for so you are ready to jump them when the time come, and i am old and fat and dont jump well.
ATM entertaining getting another brand .177 rifle, and then when the time come upgrade the Maverick to .22