Nelson Challenger with Chameleon Kit – a mess. I received a bunch of these prototype kit in various stages a while back. This is one of the messier assembies. The switch is stuck in the frame in what looks like the hive from Aliens or the outer dimension from stranger things. I tried airing it up but the pin valve wasn't making contact. Sold as is considering the condition. What I would do is mount the swich in another position and then replace the lpr and you are good to go. Very neat concept on these. See another style in the video below.
And read more about one of the kits I received with this and the standard PMI Chameleon kit at:
http://www.baccipaintball.com/oldnews/pmi-chameleon-kit-nelspot-challenger