Mine does vent the area in front of the piston to atmosphere. A threaded rod serves as the valvestem. I filed it flat on one side to create a vent through the piston/poppet towards the barrel and hammer. So the third picture is accurate.This should also mean that once the valve opens pressure can fl...

My kids are not the issue..the oldest is learning to be a metal worker and a machinist on both the industrial mill and lathe..The truth is I'm recovering from burn-out or breakdown if you will, as a result of an emotionally and psychologically abusive childhood. Basically I'm exhausted..have been fo...

Hammer valve/ QEV combo is the way to go. The hammer and spring will allow you to adjust the power versus number of shots from a given tank depending on volume and pressure. Plus...The "clank" of a hammer gives it something extra. ;) A counter balanced hammervalve is more complicated to build ...alt...