Well Ultron's got to get his tech from somewhere if this is just one movie. And what's bad about repulsors? They seemed to work for the Iron Legion.Why would Stark have to have it for Ultron to give it to the Vision?If this version of Ultron is developed by Stark and not Pym, then I wonder if Ultron's chassis will utilize repulsors for flight/combat. Oh and what about the Vision? Since when does Stark have density-shifting tech?