Whats The Forearm Cannon?

On the back of Voyager Ratchet's box it says Automorph Forearm Cannon, honestly I don't see any Cannon, is that just the Shield that he has or the Claw or something?
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Tallgeese wrote:I can pretend. Gun-axe works like a charm
Raymond101 wrote:Once I paint a bit of silver the gun concept will be more feasible and the axe will look better as well.
I actually don't mind having no missiles. Ratchet's roof rack really is awesome. A shield, a claw, and a combat stretcher - awesome multi-purpose weapon and very fitting for him. Granted, only minicons and Basic sized figures can actually fit on the stretcher, but that's still okay for me.
If you want disappointment, look at Leader Megatron, whose Fusion Cannon does jack all and isn't even complete, unlike Voyager Megatron's (I was actually very impressed with Voyager Megatron's Fusion cannon - at least it fired something).
Bumbled wrote:I never take them a part... ends up bad for me