Strawb said:
It could be done using a design nearer to that of the evolve newton valve, balanced at the front of the maker not behind the poppet.
Yes this is how the one I saw was configured. The reason why the piston has been moved on the ego (and similar) is because the LPR goes in front of the valve.
On an angel (and most over and under blowbacks) the valve chamber is right up to the front of the gun, so the piston can go right there.
This is one problem I have with these new configurations.
With the evolve newton kit you need to lube the piston every couple of months (as regular as normal angel maintinence).
This is simply a case of unscrewing the volumiser, putting grease on the piston orings and then screwing the volumiser back on.
As mentioned in another thread, you need to take half the internals out of the ego to get to the valve.