I got my 4-year-old son a Super Nintendo last week for his 4th birthday. It did not come with a Nintendo Zapper, but it did come with the classic duck hunt game. I tried to explain to him how the duck hunt game worked with the zapper. After a half-hour of arguing with a child about shooting a TV, he started crying because he thought I would break his birthday present.
This experience leads me down a rabbit hole on YouTube that did not disappoint. I found a real .50 cal Nintendo zapper but not the real Nintendo zapper.
here is a video of FullMag on YouTube reviewing the gun.