Ok so I took the front block off my gun and the cup seal with the spring attached came out. I put it back in and no the gun leaks like crazy. I put the cup seal in again without the spring and it stops the leak, but of course without the spring i can't shoot the gun. So I thought it was the cup seal but now i feel its the spring. Any ideas?
try lubing the valve pin, see if that helps. did you take the valve out?
does it leak through the front block or the valve of the gun? Most of the time when my TES leaks, it's just because I need to lubed it up, or replace orings.