It is a little under-explained though in the rulebook for the Raider, And the CR90 isn't the best example.
The SHIP has 4 primary attack. And has 3 firing arcs. Unlike the CR90, the arcs on it's rear are not any different to the arcs on it'd fore. They, in terms of the game mechanics, are all primary arcs. Not auxiliary.
Just because the CR90 can only fire primary from it's fore arc (because it's turret symbol is printed on the fore section only) does not mean the same rules AUTOMATICALLY apply to the Raider. That's why people want an official ruling.
We all assume that it is probably just from the fore section, but as it's not explicitly stated either way in the rules, we just want FFG to say so.
I've not played much epic, so I don't want to be over-using OR under-using my Raider.
Edited by InterceptorMad