First off the "tire valve" is called a schrader valve (just for future refrence). Second off scrap the pop bottle. Why? Because first off just spend a little extra money and make a PVC chamber. Plus screwing a schrader valve into such a thin materail is not safe. I dont know what it is but alot of people like making some part of there gun out of a pop bottle, nothing screams "WHITE TRASH!" as bad as this. So the morale of the story is safe up some money and make a PVC chamber. Your design will work though.
Lol this is funny. But i would strongly suggent not making it out of a pop bottle you can use PVC insted (like boilingleadbath and pimpmann22 said)
And you can make your air container (I'm sure it's not called like that) from a steel pipe that you wheld on one end and wheld a tyre valve (Schraeder) to the other. It's safe and easy to make...
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