Derived design with a trapped nut.<br>
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Blog posting:<br>
<a rel="nofollow" target="_blank" href="http://marcuswolschon.blogspot.de/2012/11/gopro-to-nerf-gun-connector.html">marcuswolschon.blogspot.de/2012/11/gopro-to-nerf-gun-connector.html</a><br>
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License is CC-BY-NC-SA<br>
So you may make one yourself and improve the design but not sell the design or made parts.
Creative Commons Attribution Noncommercial Share Alike