So this comes up a lot when people like me say we want prequel ships in X-Wing, and nasty people who don't want me to be happy say "not gonna happen - FFG have said X-Wing is Galactic Civil War era only, loser". But, as was pointed out to be the other day, and which I don't recall seeing mentioned here before: according to wookipedia
During the Galactic Civil War , ARC-170s could be found in both Imperial and Rebel fleets, where they were considered elite craft. [19]
which means we can totally have them in X-Wing, right?! I think they'd have to be restricted to Rebels just cos they look so Rebely.
I picture them having an arc like a Firespray, and some way of firing from both in one turn. This could be like a built in gunner ("once per turn after performing a primary weapon attack that misses you may perform a second primary weapon attack from the opposite arc") or it could be something you can always use, even if the first attack hits. The trouble with that would be that it would be so valuable that it would have to be very expensive, but that you'll struggle to utilize against a good opponent. I suppose everything have cost balancing issues like that to consider though.