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This video is on how to make an air gun using materials that can be found in a hardware store. It can be very powerful and can cause injuries, so be very carful when using this. This HPA gun can shoot almost anything that can fit down the barrel. It is very handy to have if you don't want to pay money for ammunition.

Here are the rest of the materials

1/8 extension pipe
1/8 to 1/8 90º flip
1/8 to 1/4 flip
1/4 to 1/2 flip
1/2 extension pipe
1/2 ball valve

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