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In page NES Zapper:

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The North American version of the NES Zapper resembled a futuristic science fiction ray gun with a color scheme matching the NES, rather than a revolver like the Famicom version. The design originally released in North America had a dark gray barrel and grip. In 1988, the Federal Toy Gun Law was signed into United States law, requiring that toy guns be visually distinct from real guns in a variety of ways, including color.[4][5] In 1989, the orange NES Zapper was released.