Certainly one of the most unusual-looking guns at SHOT Show 2011 came from Mossberg in the form of their Mossberg 500 Chainsaw. Built on the iconic Mossberg 500 action, the Chainsaw is a pistol-grip pump-action shotgun with no stock. While guns like this are desirable for home defense, they're notoriously hard to control while firing, a problem that Mossberg has solved by attaching a wrap-around chainsaw-style hand grip to the pump. Intended to be fired from the hip, this top handle allows the user to cycle the action while simultaneously maintaining leverage above the gun to help tame muzzle flip.
In addition to the chainsaw-style grip, the 500 Chainsaw has a stand-off barrel that can be used to breech doors and three rails that can mount accessories.