Instructables
Picture of K'NEX derringer
small, simple, and very powerful for it's size.
 
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Step 1: What you need

Picture of what you need

Step 2: Step one

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Step 3: Step two

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Step 4: Step three

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Step 5: Step four

Picture of step four
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Step 7: Firing

Picture of firing
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put a tiny green rod in the front.
hold by white rod and push side of barrel down with thumb.