This Hose Handle Homemade Airgun hows how to build a small airgun out of PVC pipe. While many have successfully used PVC under pressure for things like shop air I am hesitant to try it (or recommend it) for things you hold next to your face.
PVC is brittle, and if the pressure inside your gun is too much for the pipe you will have shards of high speed PVC flying out at speeds enough to blind you.
That being said, this is a cool idea, and I can see where a person would want to build their own homemade airgun.
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