Much like the guy who stuffed an NES inside of an NES controller, this modder managed to stuff a Nintendo NES 8-bit game system into a light gun controller. Instead of hacking up an actual NES system he used the NOAC(Nintendo on a chip) system.
The down side is that there’s no cartridge slot, so you have to play the games built into the NOAC board. Luckily the chip came from the Super Joy III which has 76 games. The setup is powered by 3 AAA batteries that fit snugly into the handle.