It’s still at the experimental stage but I managed to get the Sinden Lightgun working on the Raspberry Pi:
I managed to get the performance better than I thought I would be able to. The software is not as user friendly or as feature rich as the PC software. It should work across all Linux devices that are at least as powerful as the Pi.
It works best for games like Duck Hunt where you can switch off the crosshair. The mouse cursor / crosshair on the Pi does seem to animate quite laggy when shown but the clicks do occur in the right place quickly.
Running the Sinden Lightgun software on the Pi didn’t impact the performance of the games. This is probably because the games are unable to utilise all 4 processors of the quad core.