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Figured it out, what you need to do is shoot someone for the first kill, then swap to smaw and kill someone else.
Wait, that works?
Yes, its considered as getting a double kill with the smaw because it was the smaw shot that kicked it off. It works in the same sense as getting a bloodthirsty medal with a weapon, the first four kills can be anything and it counts toward the weapon challenge if the 5th kill is with the gun.