Valve leaking.

[searcher]

I was shooitng tonight and the gun is leaking out of the back where the screw for velocity adjustment is located. I have an old 68 Mag. If I shoot it several times the leaking stops for a short time and the starts leaking out that little hole on the screw. Anybody have any ideas what is wrong? I have tried lubing the gun with no succes on stopping the leak. Help please. I have tournament season about to start and I am going to use my Mag.

[Tunaman]

Turn down the velocity. If that doesn't work, change the reg piston oring and/or reg seat oring. If that doesn't work, change the reg piston assy. Its probably old and the newer ones vent at a higher pressure . I have them here if you need one. Email me.