Can you target gear on Ruin Runner? Or is it protected by the card?
Yes, you can target gear attached to Ruin Runner.
According to RiftJudge FAQ #9699:
Q: Can you target equipment attached to Ruin Runner with Salvage? A: Ruling: Yes. When you play Salvage, you are choosing a gear as the target, not the unit it is attached to. Ruin Runner's protection ability ("I can't be chosen by enemy spells and abilities") only prevents the unit itself from being chosen, not the equipment attached to it.
Nuances:
- Targeting gear attached to a unit does not count as targeting the unit itself.
- If a spell or ability specifically requires you to choose a unit (like Angled Shot), it would still be prevented by Ruin Runner's protection ability.