The 3D printed prototype made by the U.S Navy is considered legit. ... Homemade 3D-Printed, Handheld Railgun With Arduino Uno R3 Inside Fires Projectiles At 559 MPH. By Quinten Plummer ...

An Arduino Uno R3 has been used to monitor the charging levels, temperature and other statistics within the rail. Watch the videos below to see the DIY railgun in action firing projectiles at ...