Quote Originally Posted by Lyth View Post
We'll have a much better idea in a few days, since most of the Gunbreaker job lore is going to come out of a questline from 60-80. We'll also probably get a better idea once Encyclopedia Eorzea Vol. 3 comes out.

As Kaedan pointed out, Gunbreakers seem tied to the Hrothgar, who live in a matriarchal society centred around Queen Gunnhildr. Gunbreakers themselves form the Queen's Royal Guard (hence the name behind their enmity stance).
Minor nitpicking: Gunnhildr is described as an ancient queen in the Hrothgar blurb on the promotional site, and the Gunbreaker blurb says that they've "Passed on the art of the gunblade from one generation to the next." Their society's definitively stated to be a matriarchy(Eorzean scholars called the loyalists Helions because "The people's lives all but revolved around their queen's needs, as planets circle the sun."), but the era of Gunnhildr's Blades is long gone.