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Can they? And if they can, what rules should they use.
This is the issue at hand:
The new IA 2 book includes new rules for the fire raptor gunship. It no longer specifically states that CSM can take them as HS choice.
Do I use the new rules (which includes other weapons), or do I use the old rules? Or can't I take it at all.

Old rules, as those are the ones "for" chaos.