Sooo...
I thought I had a bright idea in rearranging an Axe drivetrain, but somehow forgot about the open force applied from the dump chamber. A slight re-arrangement of that inprogress idea led me to this - with a shielded flow restriction to the left face of this poppet, and chamber pressure applied to the head, I made an increasing force MQ! :rolleyes: :facepalm:
http://i71.photobucket.com/albums/i1...creasingMQ.png
If you dump the middle air chamber from the valve housing, which is connected to the air on the left face of the poppet at a higher flow rate than it's flowing in, the poppet would open. Of course you'd have to flow restrict this air going to the head, or else you'd probably end up with a valve that opens on air-up.
Words are failing me atm, I'm sorry if I confused you or made you feel like you wasted your time.
Thinking that the idea of a stacked tube, closed bolt gun that's somewhat modern isn't worth thinking about.