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How did you get a usb relay controller out of "it's just a switch"?
Take a 3.5mm cable you buy at the dollar tree, cut the end off, and wire that onto any SWITCH you prefer. As in the cherry switches we use for our arcade buttons, or a switch contained inside a pedal ect....
Are you trying to use a console lightgun on your pc? Because sometimes it's possible but keep in mind a lot of things have to be in alignment, including the version of windows you are using, the lightgun you are using, and your monitor (needs to be crt and a round one at that).