On/Off leak, is the pin too short?

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  • automikey
    Registered User
    • Nov 2004
    • 759
    #1

    On/Off leak, is the pin too short?

    I built myself a custom mag with a RPG shadow rail (I think) which had a sear installed, ULE body and an older single trigger composite frame. Then I took the X-valve out of my Tac-One and installed it. I'm pretty sure I have the ULT in there also. I put a full 13/3000 HPA tank on and if I remember it shot fine when full, but before long I noticed that there was a leak around the trigger area. If I tap the trigger a few times very lightly the leak will stop (tap too hard and it fires..).

    I thought I heard once that the sear and on/off pin should stay together when switching valves.

    Do I need a longer pin?
    Tags: None
    • Coralis
      Hyper Micro
      • Aug 2005
      • 1285
      #2
      typically a leak like that is an oring/oil problem too short of a pin will cause the gun to be overly reactive/auto fire

        Comment

        • athomas
          Of course it works-its AGD
          • Jan 2002
          • 8039
          #3
          If it is physically leaking into the rail-frame area, then the pin length is not the issue. You have a leaking oring. It is either the small black one inside the on-off assembly or the larger white one around the base of the on-off assemby. If tapping the gun causes it to fire, then you probably need to remove a ULT shim. This will allow the on-off pin to push the sear farther up on the bolt and help prevent misfires.
          Except for the Automag in front, its usually the man behind the equipment that counts.

            Comment

            • automikey
              Registered User
              • Nov 2004
              • 759
              #4
              Originally posted by athomas
              If it is physically leaking into the rail-frame area, then the pin length is not the issue. You have a leaking oring. It is either the small black one inside the on-off assembly or the larger white one around the base of the on-off assemby. If tapping the gun causes it to fire, then you probably need to remove a ULT shim. This will allow the on-off pin to push the sear farther up on the bolt and help prevent misfires.
              Thanks, it sounds like an o-ring leak. Tapping the trigger makes the leak stop a little more each time you tap it (for 3-4 taps), until you tap it to the point where it fires.

              I just don't remember this problem with the Tac-One that I took the X-valve from.

                Comment

                • Tunaman
                  Specialized AGD Tech

                  • Dec 2000
                  • 8643
                  #5
                  Does it leak with it gassed up and the trigger held back? Is the trigger rod touching the back of the trigger when gassed up?
                  Email me for low prices on ALL AGD Products and more. [email protected]
                  Tunamart

                    Comment

                    • automikey
                      Registered User
                      • Nov 2004
                      • 759
                      #6
                      Originally posted by Tunaman
                      Does it leak with it gassed up and the trigger held back? Is the trigger rod touching the back of the trigger when gassed up?

                        Comment

                        • athomas
                          Of course it works-its AGD
                          • Jan 2002
                          • 8039
                          #7

                          The slight degassing sound when you hold the trigger is normal for a level 10 bolt. Leaking down the barrel is a symptom of a carrier that is too loose or too many shims in the powertube. Remove the shims first. Then if it still leaks, try a tighter carrier. Use the tightest one that doesn't leak.
                          Except for the Automag in front, its usually the man behind the equipment that counts.

                            Comment

                            • automikey
                              Registered User
                              • Nov 2004
                              • 759
                              #8
                              Originally posted by athomas
                              The slight degassing sound when you hold the trigger is normal for a level 10 bolt. Leaking down the barrel is a symptom of a carrier that is too loose or too many shims in the powertube. Remove the shims first. Then if it still leaks, try a tighter carrier. Use the tightest one that doesn't leak.

                              Ahhh.. thank you very much. I'll test it out later today.

                                Comment

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