http://s923.photobucket.com/albums/ad72/ZambeziKid/?action=view¤t=SDC10343.mp4
As you can hear on the video, the marker fires and cycles ok, and has no gas leaks, so it does work.
However, I can't say the marker is ready to take out on the field and play.
Originally, I could not get the velocity over 220 fps. Someoneon this site advised me to try different hammer springs etc. I changed the hammer spring to a stiffer one, which seems to have made a difference. But, I have not had chance to test over a chrono, so I can not guarentee this and it may require the valve spring changing to a lighter one to get the velocity up.
Likewise, though the timing seems OK in the video, I am not going to guarentee that it is done correctly so the marker may require timing as well.
If you are still interested, where abouts are you based? Normally, I would say the best time to collect would be either weekday evenings (after 6pm) or weekends.