Air flow problem

[Shotglass1979]

I have a old 68 automag with a lot of work done on it as in its been ported on the air valve and in the on \off valve. Anyway I pulled it out after cleaning a space out and thought wouldn't it be cool to get the old boy up and running again easier said then done.
I of course changed all o-rings out for new ones and had to play around with the air hoses to stop some leaks in them all looks good but when I hook my tank up no leaks or anything but the gun won't fire when I pull the trigger nothing happens. I pulled the whole air valve out and tried to fire it by pushing the on\off valve down still nothing any thoughts on this be nice to shoot it again

[captian pinky]

tank output pressure
screw the velocity screw in more

[athomas]

What do you mean by ported on the air valve and on-off? The only porting that should be done on an AIR valve is with the old ones where a single hole needs to be drilled in the back half so that it lines up with the hole in the front half. The on-off needs nothing.

A mag valve needs at least 600psi for a level 7 bolt to work properly. A low pressure tank won't provide enough pressure.

Make sure the velocity is turned up enough. When you hold the trigger against the safety, is there a tiny gap between the back of the trigger and the front of the trigger rod?

Is the rail bushing in place?