Sinden Lightgun - 2 Pack Color:Blue - Red then a replacement USB cable

then a replacement USB cable and camera module

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It is most likely to be the cable in my experience but there is no way to diagnose for sure

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if the lightgun is the only lightgun connected

Sinden Lightgun - 2 Pack Color:Blue - Red then a replacement USB cableThe Sinden Lightgun is the world's only true LCD television compatible Lightgun in that it works directly off of the television light and doesn't require any other hardware such as sensor bars. It does not require constant re calibration and remains perfectly accurate even if you change position or angle. Support the project and be one of the first people in the world to own a Sinden Lightgun and play compatible classic Lightgun games on your LCD OLED