Classic Chuff/PumpMag Problem

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

    #16
    That eliminates the on-off area. Replace the powertube oring. If you don't have one, swap it with the one around the bottom of the on-off assembly.
    Last edited by athomas; 06-02-2010, 04:38 AM.
    Except for the Automag in front, its usually the man behind the equipment that counts.

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    • LinearGoose
      The Goose is Loose!
      • Feb 2006
      • 580

      #17
      I made the swap but it still leaked every time I lift off the trigger or the gun wasnt cocked. I think I am going to get some spacers and a rebuild kit for the valve.

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

        #18
        Is your sear worn at the tip where it holds the bolt?
        Except for the Automag in front, its usually the man behind the equipment that counts.

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        • LinearGoose
          The Goose is Loose!
          • Feb 2006
          • 580

          #19
          Now for an updated,
          I installed a new reg seat again, seems like the one I had went bad, pt oring, on/off oring and also a .220 spacer. It has a new main spring as well. Gun works perfectly in mech mode, but when I install the pump kit it seems to still be capable of shooting without me stroking it. Not saying it doesn't try to resist the urge to not shoot, and provide me with some chuffs, but it still allows the bolt to blow forward on occasion without me having stroking it before each shot. It shoots the best when I pump it, but I can also get away with squeezing the trigger again to make it go off which is defeating the purpose of the pump. No leaks anymore, just the gun being able to shoot when it is not suppose to. I'm thinking it is the wave spring that is giving me the trouble. I also have the bumper cut to fit inside the wave spring like the link Ando posted.
          Last edited by LinearGoose; 08-11-2010, 05:01 PM. Reason: Clarification on what was installed on the valve

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          • Smoothice
            Registered User

            • Nov 2006
            • 4579

            #20
            You either need a week main spring (old) or cut your new one. The spring is too strong and is over powering the wavespring.

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            • Ando
              Magusmaximus
              • Jun 2009
              • 4144

              #21
              One of 2 things. It's either a warn wave spring or your bolt spring is doing it's job. It's best to use a worn bolt spring with a pump mag. Use your old spring you had in before. If it's still doing it you might have a worn wave spring. You could also try using a full bumper instead of a cut one but the pump stroke might be a little hard so you might be looking at getting a new wave spring if all else fails.
              Last edited by Ando; 08-11-2010, 04:03 PM.
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              • LinearGoose
                The Goose is Loose!
                • Feb 2006
                • 580

                #22
                Installed an older and shorter main spring, works perfectly now. God I love mags... Thanks guys for the tech support. Any idea on where I can get some more wave springs for future reference?

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                • Ando
                  Magusmaximus
                  • Jun 2009
                  • 4144

                  #23
                  Talk with Rainman over on MCB.
                  http://www.mcarterbrown.com/forums/m...ainman229.html
                  My Feedback

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                  • LinearGoose
                    The Goose is Loose!
                    • Feb 2006
                    • 580

                    #24
                    Sweet I'll give him a holler pretty soon.

                    Now for a picture of the finish product:

                    Cant stop showing it off
                    Last edited by LinearGoose; 08-11-2010, 05:02 PM.

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