The schrader has been replaced, new end cap fitted and about 4 inches has been cut off from the chamber.

Whole cannon.

BV. Closed.

End cap with schrader and silencer, which worked at first, but then i blew the end off and it kinda don't work now.

Waste pipe silencer, didn't work, i don't think.

Silencer again.
Comments?
EDIT: Oops, sorry for large pics, i did resize, obviously not enough.
VIDEO:
[youtube]z8FdxAHUbYw[/youtube]
(pasted from uksgc, they know what it's made of already so if anything is unclear just ask and i'll do my best to answer it)