This maybe more video related because how the guns work.
RGT:G1 Light Gun
http://www.iconic-corp.com/gaming/g1/
it would be cool to get this camera senser to work with the older systems. i would like to play house of the dead 1 on my nice rgb saturn when connected to my HD tv. i wounder if some odd ball chinese company had tried to make some adapters for old school systems. kind of like use system X controller on system x but for guns.