Hey Thad,
My understanding is that CZ is changing the format of how they are joining barrels to actions with the end result being that barrels are going to be able to be switched out for different calibers. They have come out with adapters for the different mag sizes and you will soon see packages where multiple barrels and magazines will be sold in kits. Soon your 455 22lr will be able to be switched out and fire 17hmr. This is still in the works but we will probably see these guns sometime this summer.