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This is meant to go on the universe inferno mold to make him a bit more screen accurate.
You will need to unscrew the original arm, take out the fist, and put in the swivel joint. The Cannon attaches
via a 5mm port and can be stored in vehicle mode as shown.
Blast effects can also be used with it but It wasn't intended to. This is an added surprise.
I do all of my prototypes at home. I am not sure of shapeways tolerances.