frogfish, I had the same exact problem when I got my T97 full size. The thing with realsword barrels is they have an extremely tight tolerance of metal between the outer barrel and inner tightbore barrel. When they first install the tightbore, they spray the outside with silicone oil which almost gives it a suction to the outer barrel. I thought at first it was glued on, but I just kept wiggling and tugging with the hop-up unit and eventually the whole assembly came free. Of course I imagine you were probably worried breaking the damn thing (as was I) but everything was fine after I got it out.
Oh btw, I ordered mine through precision airsoft, and it got drop shipped from some distributor in Missouri. The flash hider was glued on, so I just used the boiling water method. Seemed to work, but still took a bit of elbow grease to free it off the end.