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You just need the 12 dart clips from the Tactical Vest.
No, I actually have the Tactical Vest (not worth it, Airsoft vests cost the same and are much better quality) and it comes with either 2 or 3 clear clips, but they are definitely 6 dart clips. Some people have made their own 12 dart clips, but you're probably thinking of the flip clip which is it's own pack and just connects 2 clips.