utflyer

I have a question if anyone has a minute. I know this rifle is touted as being capable of changing barrels, can anyone tell me the requirements? DO I just buy the new barrel and swap it out, or is there more such as the action and magazine and such. Also is the rifle itself identical reguardless of which one you purchase with the exception of the barrel you order or are they different rifles altogether. Im asking because I want one and just want to make sue before I get committed thanks so much