The papercraft Nintendo NES Zapper light gun I made back in 2006 has a working trigger, but of course nothing happens when you pull it... ;o)
This is the orange version of the NES Zapper, but I also made the dark grey version, both of them and the instructions on how to build them are available from my papercraft webpage. See the release video I made here: [link]
This shows how I broke down the dragon plume on the Black Knight's helmet into separate parts, because when I'll make it as a papercraft part, it will be much easier this way than making it as one hollow piece.
Basically, you have the main body, and everything that's thinner (like the tail tip, tail spines and the beak) and everything that's thicker (like the wings) are separate pieces that will be assembled and glued on separately: [link]