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This item is part of a shoulder cannon assembly intended for Generations Shattered Glass Megatron. This is a two-part set that forms the articulated base of one shoulder cannon. The cannon barrel is sold separately as part C. Part B is identical to part A, but mirrored. Parts may require some work (sanding, cutting) to fit together properly.
Parts A and B can be printed in a variety of stronger plastics, but part C is recommended to be printed in Smoothest Fine Detail Plastic.