I've been playing my Discovery captain off and on for a long time and got to 45th today. He's been using the beam arrays he got while still in the past since they seemed to level up with him. They are of course still common rarity but they have the show's pulsing effect when they fire which I really like for this particular character.
I went to do an upgrade on them and was surprised that it wasn't an option, even the ones with the infinity symbol (the emitter-linked versions) cannot be upgraded. I assume they will not keep getting better as I level up past 50 plus I'd like to max the rarity as well. I see some on the exchange with the same icon but with a mark level that I assume would have that same fire effect. Is that the only place to find them? Is there an alternative with the same look and feel?