I think the main reason that it never took off much was that it kinda sucked. It worked great when it worked, but the tracking was often glitchy and it was super frustrating when you're counting bullets to have the occasionally shot go offscreen. I have a feeling we had a higher tolerance for this with Duck Hunt due to the novelty and arcade games due to the format. (I feel like arcade games tend to avoid showing you a reticle for this very reason, but I don't have data to back this up.)
That being said, I still ended up beating Metroid and both Resident Evils, so they were still super fun!
Also, I was in Dave and Busters recently and they had Time Crisis 5. Beat that too!
They were mouse controlled, but I had a gyration air mouse -- (with the clever thing of instead of requiring infrared, it just had a 3rd button that had to be depressed for actual movement)
A kickstarter a few years back for the Sinden light gun [1] realized that by using webcams, some quick image processing and perspective transforms, you could make a light gun work anywhere and could get real-time performance on non-CRTs by essentially adding a small border region of the screen, making it work on essentially any monitor. He filmed and wrote extensive technical breakdowns about the build process and mechanics at play, which were great.
The maker also seems to have had a solid understanding of what made those old light gun games cool, because he made sure to build versions with solenoid-based recoil as well as the big chunky metal foot pedal you’d use for games like time crisis.
The current open source competitor to Gun4IR is the Samco light gun [1]. It uses four LEDs as well, but with two on the top edge and two on the bottom edge of the screen. A couple Wii LED bars will do the job here as well. I don't think it is quite as accurate as the Gun4IR as I don't think it accounts for perspective correction if you move from the position it was originally calibrated at. But...
Sam & a few others are readying a new design called OpenFire [2] that will be at least on par accuracy-wise as Gun4IR and will be fully open source and cross platform. It should be available relatively soon. Pair this with the PiCon [3] and you have a lightgun with a pretty crazy feature set. All the guns mentioned support some kind of solenoid & rumble support, but the PiCon kicks it up a notch with exclusive OpenFire features like an OLED display, NeoPixel LED, accelerometer, and analog joystick.
[1] http://forum.arcadecontrols.com/index.php?topic=160517.0
[2] https://www.youtube.com/watch?v=aE9a-fsnMwU
[3] https://diylightgun.com/lightgun-details/?lgid=506
edit: make more specific reference to OpenFire
https://www.smythstoys.com/uk/en-gb/toys/games-puzzles-and-b...
Tbh I don't remember if it had a cover option or not.
[1] https://www.amazon.ca/PlayStation-Move-Shooting-Attachment-S...
it was really fun with a friend