FYI Kath can't give stress if using the ion cannon. Ion cannon cancels all dice results if successful.
But opportunist and gunner seems like a decent combo. I used it in a 2 YT list once. I have since replaced it with different upgrades to make the 2 YT list more of a tank vs more damage output.
Actually this is incorrect. You roll your attack dice and modify said dice. Crits that result then need to be defended. Any hits/crits that are not defended are then negated, the defender receives 1 ion token and 1 damage.
So you can indeed stress a target and give him an ion token.
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You are wrong. RTFM. I've cut and pasted directly from the FAQ below. Page 7, middle of the right column. Kath CAN NOT give stress when using an ion cannon.