Of interest...
Looks alot like a DIY kit - perhaps?
The US Navy has announced a successful test of an electromagnetic cannon capable of firing a projectile 110 nautical miles (200km) at five times the speed of sound.
Full article below:-
http://www.theaustralian.com.au/news/world/us-navy-test-fires-electromagnetic-cannon/story-fn3dxix6-1225969338266
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