With the latest FAQ, it looks like it's possible to make two TLT attacks where the first one misses and the second one hits and then make a primary weapon attack with Gunner afterwards. However, it's a bit contentious, so I wanted to work through it.
Relevant rules text:
Twin Laser Turret: "Perform this attack twice (even against a ship outside your firing arc)."
FAQ: "When a card effect instructs you to perform an attack twice, it means: 'After you perform this attack for the first time, perform another attack against the same target using this weapon.'"
Gunner: "After you perform an attack that does not hit, you may immediately perform a primary weapon attack."
Rules Reference: "If multiple abilities resolve at the same time, the player with initiative chooses which of his abilities to resolve and resolves them in the order of his choosing. Then the opposing player does the same for his own abilities."
Argument in favor of TLT-miss-hit-Gunner:
When you make your first attack with the TLT and miss, two abilities resolve at the same time ("after you perform an attack"). One is the second TLT attack and the other is the primary weapon attack from Gunner. Because two abilities are resolving at the same time, you can choose to resolve the second TLT attack first and then the Gunner attack after that, regardless of whether the second TLT attack hits or misses.
Rebuttal to argument in favor:
You don't (or won't continue to) have complete freedom in resolving abilities in the order of your choosing. Resolving "nested" abilities is confusing and will be forced into a more intuitive order via the FAQ. The example here is Darth Vader (crew) which in theory could be used as miss-(Gunner-Vader)-Vader, but the FAQ requires it to go miss-Vader-Gunner-Vader.
Argument against TLT-miss-hit-Gunner:
The text for Gunner says you may "immediately" perform an attack, which implies that you must resolve it before other abilities that resolve at the same time. If you instead choose to take the second TLT attack and hit, you've missed your opportunity to use Gunner because you didn't do it "immediately".
Rebuttal to argument against:
All abilities get resolved immediately when they're triggered -- the word "immediately" doesn't have any additional rules effect. Further, there are lots of abilities that are regularly used before Gunner even though they resolve at the same time and Gunner says "immediately". If Gunner has to resolve first, then the following staple combos (and maybe more) would not be possible:
- Miss, get a TL from Fire Control System, then make a second attack with Gunner and spend the target lock.
- Miss, get a TL + focus from Bossk (crew), then make a second attack with Gunner and spend the TL/focus.
- Miss, deal damage with Darth Vader (crew), then make a second attack with Gunner.
Darth Vader (crew) comes up again, and this time he's an explicit example in the FAQ of resolving a different ability (Darth Vader) before the "immediate" ability of Gunner.
Conclusion:
My read is that TLT-miss-hit-Gunner is currently allowed, but I wouldn't be surprised if they update the FAQ again to explicitly disallow it (though I kinda like it as is, I think). I'd definitely appreciate them addressing this combo one way or the other in the FAQ.
Am I missing anything?