It looks like the Wave 0 & Zombie mould doesn't have a weapon... while the regular release version has an oversized (almost Mechtech styled) weapon. Not sure if a club he coulda picked up from the side of the road counts as much of a weapon though. Running at the Decepticons, who are armed to the teeth with laser weapons... it's no wonder Cliffjumper is... uh, never mind.
(wouldn't the fact that there is a Zombie version be considered a spoiler by Hasbro?)