Introduction: Railgun, a Knex Roller Coaster

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About: Hi!, I`m Levi I`m back building! and i play Videogames like Fifa 14/15
Hey guys!, its been a while isnce i poste anything on Instructable!, but here it is i`ve made a new roller coaster in the past weeks!,
i give you, Railgun!

http://www.youtube.com/watch?v=TVTkyl5Bv-I&feature=youtu.be