Ok, simple question. Does the target of snap shot have to be in primary firing arc?

Yes because it's a secondary weapon attack.

Yes because it's a secondary weapon attack and doesn't say otherwise on the card.

Ok, simple question. Does the target of snap shot have to be in primary firing arc?

Yes because it's a secondary weapon attack.

This looks funny, but it's true. Check the Rules Reference definition of Secondary Weapon for the rule that restricts them to your primary firing arc.