Originally posted by MrScorcher
Clean the valve. Clean the regulator piston assembly and change the oring. If it still leaks out the back, change the regulator seat oring. If it still leaks but the leak goes away when you reduce the velocity, you will need a new regulator piston assembly.

but it stops when trigger is held is this still carrierleak? with the red spring its not rolling down the barrel at first shot.
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