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Phantom not shooting on a fresh 12g

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    Phantom not shooting on a fresh 12g

    I am new to phantoms and just picked one up second hand. Put a fresh 12g in it and it would cock but when the firing, the hammer hits the valve but all I get is a little pop. I have experienced this before with markers running too high of a pressure so I burped a little air out of the 12g and she fires fine at a reasonable velocity.

    Thoughts on getting this thing to shoot on a fresh 12g. I have not had this problem with my Trracer, Buzzard or any other nelson based marker before so i am kind of at a loss.
    Last edited by Memornix; 09-29-2020, 04:08 PM.
    "but we all have electros and you guys only have pumps, this wont be fair"

    (chuckling quietly) "we know"

    My collection:
    https://www.mcarterbrown.com/forum/p...x-s-collection

    #2
    Sounds to me like the previous owner tried tuning it for low pressure, and the high pressure from CO2 is keeping the valve shut.

    I would check the valve and main springs, and try swapping them with fresh stock springs if you have a pair. Also check for dirt or anything impeding movement of the hammer, or any other non-stock tweaks you see inside. Check all the seals and give it a good cleaning while you're in there.
    Dulce et decorum est pro comoedia mori

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      #3
      Or, just thinking it out, maybe the TPC is unthreaded out of the bolt. That's the "Tuned Port Compensator" that you adjust down the barrel with a special tool to tune velocity (or take the barrel off and use a screwdriver)

      I'm not sure if that would cause the problems you're experiencing but it is possible to over-adjust the TPC
      Dulce et decorum est pro comoedia mori

      Comment


        #4
        Yeah, it is definitely a too much pressure on the valve issue. I have not opened the valve to check the spring yet, but that is my next place to go. Just curious if there was some weird phantom kung foo I didn't know about.

        I did adjust the velocity on the bolt after I burped the 12g and got it shooting 280s so I don't think that is the issue
        "but we all have electros and you guys only have pumps, this wont be fair"

        (chuckling quietly) "we know"

        My collection:
        https://www.mcarterbrown.com/forum/p...x-s-collection

        Comment

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