My breech knob is stuck! How do I pull it out?

[kpaintball]

Ergz, help

[kpaintball]

nvm
I fixed it
But I got another problem.
The velocity on my angel can't get up to 285 fps for some reason when my tank is around 1500psi-2000psi. Wats wrong? It didn't do this when my tank was full up to 4.5k.