October 20, 2015:
A man has used a 3D printer to make a shockingly powerful hand-held rail gun capable of shooting projectiles at more than 900km/h.
The creator said it was designed using widely available parts and a 3D printer.
Instead of gun powder the weapon uses electromagnetic pulses to fire projectiles at high speeds
http://www.9news.com.au/world/2015/10/20/10/21/man-creates-powerful-weapon-with-3d-printer
FYIO - Video/Youtube link in article
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