I Could Watch This DIY Propane Rifle Fire All Day [Video]

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This propane rifle was built with just a few simple components, but the firing effect is awesome to watch. All it required was a self-igniting propane torch and some 7/8 inner diameter tubing. The Backyard Scientist went a step further however and colored the flame green with boric acid. Adding a little powdered charcoal resulted in an orange flame with sparks.

See the video of the gun in action after the break.

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