1/2 Inch PVC Blowgun Dart Cone
thingiverse
I was experimenting with it in 1/2 PVC, and it works really well there. To fit an 18 ga nail inside, I drilled out the center and secured it using hot glue. It's a customized version of a popular project found on Thingiverse - specifically, this one: http://www.thingiverse.com/thing:106142.
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