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New Knex Barrel? Answered

I was trying to design a new knex barrel and saw i had an excess of roller coaster parts. So i made a long plain straight piece of track and just attached a rubber band to a cart then the front of the track and it had so much power because of the zero friction barrel. So i was wondering if we could form this type of barrel into a new breed of knex guns. Comment if you have ideas.

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As DJ said: Pictures>Words. A picture would help us to figure out what you are saying. (Show don't tell.)

Get pictures and we can answer.