Fx barrel interchangeable

Keyman, I'm not sure about Dreamlines but the complete barrel assembly from the brass inlet to the end of the shroud is interchangeable between the Impact and the Crown. If your swapping same calibers (maybe just different liners installed) the barrel assembly is all that needs to be swapped. If changing calibers then yes you'll need the correct probe and magazine or SST. The only difference will be the looks of the shrouds from one gun to the other. They can also be swapped to keep the same look and maybe performance. 

Jking