Yes Ryan, you can cut down any barrel & produce your own Carbine, but you would reduce power & accuracy too, even if you crown your barrel you will loose accuracy no doubt even if you bring the power up. I have tried many short barrel mods & they will not shoot tight groups beyond the 30 yards, but you could buy a second barrel for your S200 & have a go, but you would not want the cylinder longer than your barrel, unless you chop the cylinder & run it through the butt on fill pipe, or move the whole action back in to the butt, skies the limit
Have know idea why the Bullpup