Would this work?

[Infernal Maveric]

Would that set up work at all? I know the drwings are crude, but paint is the best I have. Any suggestions?

[saladtossser]

it would, 3/4" bushings fit most bottles, the tyre valve should not be there, put is somewhere in pvc fittings.

[CS]

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.

[boilingleadbath]

You trying to get us sued, pimpmann?
Schraeder is a brand name, you know; tyre/tank valve is fine.

[Cronic]

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...

[Infernal Maveric]

Oh ok thanks guys. I Guess I'll try and invest a bit in a PVC chamber