I currently have a .30 cal Impact 2 COMPACT power plenum . I want a 700 mm barrel also and am aware of the barrel kits offered by FX and the much larger carbon bottles. My question is that if I wish to have the long barrel in 22 or 25; would that be simple to do or is it much simpler to just stick with a 30 cal slug shooter? For me pellet guns are perfect to 100 yds. This will be for 100 yds +. I was wanting a 22 as it is the caliber I shoot most but not sure how difficult to swap calibers. Do you just write down the settings for the tune for each barrel and re-adjust the settings? Being an AR15 guy I am used to pulling 2 pins and installing any upper on the lower receiver. Never had an airgun apart yet so pardon the inexperience.