This toy is a transforming arm cannon, fashioned after Megatron's weapon of choice, and his Earth alt mode.
Megatron's arm cannon is very similar to the Starscream and Optimus Prime role play items offered a few years back. These also transformed from a representation of the character's alt mode to a 'glove' holding a weapon that can fire nerf-like darts.
You can view the retailers order page here, and images of the item below.
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