Oh no, he doesn't own them, the faction does. With the money generated by the Exchange's legitimate half, run by Mr. Fros Tii, they purchased the guns as a way to break into the field of running them to groups like the rebels and the mandos, who are either in hiding from the sith or under blockades.
I apologize again for not asking your permission for using them, and have worked to rectify things so that they will be more legitimate in the future. Soon, I will be updating the page with descriptions as to how every asset was earned, as well as some small backstory to things like the ships.
I was looking over the tech profile after you first PMed me and I saw that it was for law enforcement or PMC. That isn't what I remember being there when I first wrote up Jax's profile and gave him the blasters.