wiigun.jpg
Don’t think the Wii Zapper is up to snuff? If you can bear opening up a classic NES light-gun then consider this mod found over at AcidMods. –Link

Related:
DIY Wii Gun
DIY Wii gun –Link

SNES/NES controller to gamecube/Wii conversion project
SNES/NES controller to gamecube/Wii conversion project –Link