Most toy guns marketed for kids' video games in the United States are brightly-colored or white, to distinguish them from real guns. But he said he didn't think there was a way for Nintendo to regulate what overseas third-party manufacturers create for the Wii console. Nintendo might not have even known the realistic-looking gun existed, he said.
He also said he doubted there were many shooting video games meant for young children. Those that do target kids, such as Nerf N-Strike, try to design toy guns that don't resemble the real thing.
Gun-control advocates say it's one more reminder of the dangers of guns in the home.
"The fact that there are things like this Wii toy that look like guns, make it all the more important for the adults to keep the guns away from the children," said Paul Helmke, president of the Brady Campaign to Prevent Gun Violence. "Keep it locked up, keep it secure, or don't have it at all."
Though not all gun accidents end as tragically as Cheyenne's, he said this kind of incident happens "all too often." In the United States, he said, a gun in the home is 21 times more likely to injure a family member than protect the home from intruders.
"It shows once again that guns are not toys," he said. "Guns should not be left around where a child could get to them."