Just wondering what upgrade card they refer to when they say this and what ship comes with it. I was suggested to use it with a Falcon build when fabricating some lists.

Gunner comes with the Firespray/Slave I.

Gunner is a generic version of the Luke Skywalker crew upgrade. It costs 2 less, and doesn't have the Crit-boost mechanic.

Here's a picture for reference:

simple enough, thanks everyone.