I haven't talked to Martin Dorociak in a long time but X-Rockets still appears to be in buisness and sells 80/20 launch rail kits visit: http://www.x-rockets.com/launchrails.html

I now 3D print my own Nylon rail buttons :
https://www.thingiverse.com/thing:1493679
https://www.thingiverse.com/thing:3067689

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Bruce S. Levison, NAR #69055