2 questions for new CO2 powered gun

[absinthe]

i am planing to build a co2 hammer valve gun that uses "soda stream" bottles directly screwed into the system (i have a few and i can refill em myself)

i am planning to use all brass fittings on the pressure side (threaded unions etc no pipe) and i have been looking for any pressure ratings and have not had any luck so far..

does anyone have/seen a pressure rating chat they could sent or link me to?

also i am looking for a good 6mm barrel (I'm going to use BB's as they are fairly easy to get)

any ideas for a BB barrel in Australia?

[MrCrowley]

any ideas for a BB barrel in Australia?

Check hobby shops or personally I use the metal tube from a weedsprayer, I found one that fits BB's pretty well and you can get a good 40cm straight section from the tube.

[absinthe]

thanks i have read you talking about that before what i really need is pressure ratings will brass fittings handle unreged co2?