It has a 100mm (4") outer casing 1m long and a 40mm (1.5") pipe running through it that is 130cm long. there is 30 16mm holes spaced down the barrel. The outer casing is held onto the pipe by dwv fittings as i didnt realy feel like shelling out 50$ per fitting. i also did not glue it because i wanted to be able to take it apart it and because its a proof of concept for me.
It is stuffed with 7 or 8 cotton T shirts which i may change for actual insulation later.
Enough talk here are the pictures.

its not pretty but it works well just ask Watto

EDIT: first vid is without supressor on watto's 'Thunder Down Under' and second is with it on.
[youtube][/youtube]
[youtube][/youtube]
made a more noticeable difference in real life.
