There’s a lot of nostalgia for this one

not to be that guy, but that's not a guncon. Only Namco made guncons. you can tell because the guncon has an extra cable that plugs into your composite signal. that lightgun you have probably works with area 51 but not namco games (like time crisis)

Is this guncon compatible?

If you really wanna play those games on switch, jailbreaking and using RetroArch with preemptive frames is the way to go