Buddy bottle

Hi Guys,

I am looking to build a buddy bottle but one that will fit inside a consolable stock and as its not the run of the mill thing Google hasnt been a grate help!

The advise I need is:

– if, who and where can I buy complete valves from?

– what material should I use for the tube? can I thread the tube without weakening it?

– Is it safe to plug the other end with a threaded plug or does it need to be welded?

I have tried to speak to people who manufacture gas tanks but they are reluctant to give advise due to liability, which is fair enough.

I realise I am asking a lot so any advise is much appreciated

Cheers MA