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Only works on elevated rails, sorry.

Step 1: All in One!

Pic 1: make 2 of these
Pic 2: attach them with white rods.
Done!

About This Instructable

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Bio: I like to make knex guns, swords, and medieval artillery, I sometimes draw, play music, and Mod nerf guns.
More by tinyhooman:My Nerf Modulus Loadout How to Fix Old/broken/stepped on Nerf Darts. Knex Gun Guide 2016! 
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