Well, according to the table, the answer is yes, but not in the way you'd like it. The way it's written makes it sound more like for raid weapons, you can only exchange for 1 copy per month (at 2 ori each). On the other hand, the exchange exclusive weapons are limited to just 4 (1 ori per), so if you want, you could just burn 4 ori right away for a 3* copy of one of those. A desperate enough fire main might as well go for that gun.
weapon wise, yeah....
but from what i can tell, they have a decent amount of strong SSR hime... not sure on the SR part, but even some R hime for them is good....
they lack in weapons, but have a nice amount of womanpower...
it's just unfortunate that a lot of their good weapons seem to be Gacha only...
Maintenance complete.
Oh, side note, dark ragna is out 2 events earlier than expected.