Instead of scrapping the gun after initial tests were less than successful, I decided to transform it into a 6mm bolt action, fully capable of being magazine fed, but piss poor performance when it's correctly configured for mag feed (again, god damn those seals) So instead, at the moment it is muzzle fed.
The feed system was based on a fully automatic version of the Girandoni, that I designed and tested to great success at an earlier date in a testing rig, sadly the success was a one off, and this little beast will never hear the magical 'dakadakadaka' that it was intended for.
The two inline valves are both cut-down schraders, delivering enough gas for around 100 power shots (high-end airsoft power) all on a single fill, and the trigger is fully customized to have the 'perfect' weight when firing.
All the parts were made entirely by me, no lathe, no milling machine, just one determined guy and a file set, and all parts were soldered together, and hydro tested to 300 psi, no leaks.
I have a few pictures of when I was making it, and very few of it completed, I *might* put some firing and/or damage shots, but it's nothing worth shouting about.
If your interested in trying to make it work yourself, or alternately just want to have a clean looking compact hammer valve gun I have a full set of machine plans that I made, be good to see someone other than myself to put them to good use.
Please ignore the awful editing of the video, I really couldn't be bothered to rotate all the pictures, and chronologically it makes very little sense. It was done mainly because all the pictures were over the s'files 1mb limit and this seemed the easiest way of overcoming that, but, all the same, here it is:
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As always any questions, asks, or criticisms are always welcome, I know I haven't explained nearly half of what need be, so don't be shy in asking,
The fully automatic dakadakdaka in the video* was achieved by partially blocking of the breech so that the gas could only escape round the bolt, which really shows how much of a bad fit it was!
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Update:
Video of it cycling and pictures
*(please ignore my bad tastes in music in the background...
And yes, in fact it makes you truly appreciate what you could do with machine tools when you have to try so hard to avoid designing things that would require them. 
