Don't know if this has been brought up in another thread yet but this interaction looks tasty!
From the new FAQ:
"If an attacking ship is equipped with both Gunner and IG-88D and there is a friendly IG-88B, and the attack misses, the attacking ship can then attack with a ? secondary weapon using the effect of IG-88B and then attack with the primary weapon using the effect of Gunner. See 'Timing Chart for Performing an Attack' on page 8."
Reading the cards it works RAW since IG-88B never specifies that you cannot attack again this round. I guess until I saw the new FAQ I assumed it wouldn't work with Gunner.
As it stands, the only Scum ship with the slots to make this work is the YV-666. Has anyone tried it in a list yet? I'm excited by the prospect of actually using IG-88 crew since its a cool idea with very few practical applications. I was thinking Moralo Eval with a Mangler Cannon, Gunner, IG-88D crew and Dengar crew. Flavor IG-88B pilot to taste