NOTE: the barrel is NOT plugged.
[youtube][/youtube]
This is a sneak peak of my WIP.
The pop off valve is set to 60 psi, it pilots a 1'' sprinkler valve, which feeds a 1'' blow back bolt, once the bolt is open, it dumps into the barrel.
EDIT:
The bolt functions properly with or without a plugged barrel.
dry firing, will chamber a round.
once i design a proper spring fed mag, a full auto firing video is in order!
![Image](http://img862.imageshack.us/img862/4976/gun1.jpg)