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Umarex T4E HDR50/TR50 paintball revolver velocity adjuster "pre-order".

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    #31
    Troubleshooting issues after the adjuster is installed.

    Plastic revolver clamshell does not want to go back together after adjuster installed:
    Tighten the rear brass aired-up indicator housing screw a bit more, or remove some plastic material from where the brass screw slides into the clamshells.

    Leaks out of the back of the gun:
    Is the leak coming from around the adjuster screw? If YES, make sure the adjuster screw isn't screwed too far in. The adjuster screw should never be screwed in further than flush with with the back of the gun (the plastic shell). Any further and you risk pushing the o-ring passed the 0.5mm dump chamber fill hole.

    Else if YES, the leak is being caused by either the M1.0x7.5 o-ring on the bronze adjuster housing, or the M2.0x3.0 o-ring on the stainless de-volumizing plunger. Replace and re-grease the o-rings. Use DOW-55 grease on the M1.0x7.5 o-ring, and DOW-55 in the M2.0x3.0 o-ring grove, and DOW-111 on top of the o-ring after installed. If leaks still exist, try using some PTFE (teflon) tape in the o-ring grove before installing the o-ring.

    If NO, is the leak coming from around the factory brass aired-up indicator housing screw? If YES, make sure it is fully and firmly threaded in, and if so, replace that o-ring (M1.0x12 (1.00MM CS, 12.00MM ID, 14.00MM OD)).

    Gun jackhammers/farts/bolt sticks when fired:
    Did you lube the gun when apart? If YES, did you use a thick grease? If YES, remove the grease. Use only very light grease or oil. These guns are very sensitive to friction, due to their unregulated/on-off less valve design. If the bolt moves too slow, the dump chamber will refill too quickly, causing the bolt to jackhammer/fart/stick until the rapid release of CO2 causes a pressure drop due to chilling, and finally allows the bolt to reset.

    If excess/thick grease is not the problem, make sure you are firmly pulling the trigger completely back. There is a small area in the trigger pull where it is possible to hold the sear down without resetting, causing the bolt to free float/cycle. Pulling the trigger completely back (or releasing the trigger) will reset the sear and stop the bolt.

    If none of those fix the problem, replace the M1.5x8.0 o-ring. This o-ring seals off the dump chamber, allowing it to fill only from the small 0.5mm fill hole. Lube this o-ring only with oil, and make sure the rear brass screw is tight and firmly compressing the o-ring. However, do not over tighten/compress the o-ring, or it may pinch out of place and allow another air path into the dump chamber.

    Jackhammering/farting may still occasionally occur even if everything else is correct when the velocity adjuster screw is far into the gun. This is because of the significantly reduced dump chamber volume being able to fill faster, even when being restricted by the 0.5mm fill hole.

    The gun is aired up, but nothing happens when I pull the trigger:
    Screw the adjuster out a bit, as it is screwed in too far, and the o-ring is sealing off the 0.5mm dump chamber fill hole.
    Last edited by William the Third; 08-16-2021, 03:19 PM.
    I can haz feedback?
    If I owe you feedback, just remind me, as I sometimes forget.

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      #32
      More than a little interested. I have these pistols in the hands of all 3 of my family (wife and 2 adult children) as well as about 4 other former customers of my airgun store. As soon as these are ready to go expect a sizable order from me and mine. Looks like an excellent mod.

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        #33
        So after getting some positive feedback from an early tester, I'm ready to sell a few of these. They will sell for $45 shipped (US, elsewhere in the world contact me, and we'll figure it out), and I've got 10 ready to go.

        Remember, the goal of these adjusters is to allow for adjusting, primarily by dropping, the velocity so these are paintball field legal. If you want something that will boost/increase the output/velocity, this is not the modification you seek.
        Last edited by William the Third; 08-31-2021, 03:40 PM.
        I can haz feedback?
        If I owe you feedback, just remind me, as I sometimes forget.

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          #34
          I just purchased two of these. Think that adjusters will work in them? Figured they will be good for the kids in the backyard. Add says 7.5 joule so it should be good right?

          https://www.amazon.com/gp/aw/d/B07PH...b_b_prod_image

          I will take 2 of the adjusters if they will work.

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          • William the Third

            William the Third

            commented
            Editing a comment
            I'm 99.314159% sure they will fit, as that's the same one I have. I'll send you a PM.

          #35
          Alright guys, 8 remaining in this current batch.
          I can haz feedback?
          If I owe you feedback, just remind me, as I sometimes forget.

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          • Johan
            Johan commented
            Editing a comment
            Hi, would be very intrested in one. Got the 11j version.
            Do you have international shipping ? I live in Finland.
            Got paypal for payment

          #36
          I’m in for 2.
          paypal?

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          #37
          Payment sent.
          thank you for all you have done.

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            #38
            Can confirm that these do fit the 11 Joule HDR50/TR50, as initially expected. I purchased an 11J valve assembly from MCS just to confirm. The following is what the 11J valve looks like. It has a "C" shaped devolumizer, that must be removed to install the velocity adjuster. There is also a threaded in flat disk with a tiny hole that acts as the dump chamber fill restriction. This should probably also be removed.

            I can haz feedback?
            If I owe you feedback, just remind me, as I sometimes forget.

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              #39
              Has anyone tried this on the HDP shotgun model?

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                #40
                This will not work on the HDS .68 cal shotgun
                I can haz feedback?
                If I owe you feedback, just remind me, as I sometimes forget.

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                  #41
                  Crappy installation video acquired!

                  First, I'd like to apologize. The potato I used to shoot this video got so hot that it baked itself, and started losing focus near the end of the video. This video is a cure for insomnia, disguised as a video for installing a velocity adjuster into a Umarex HDR50/TR50.

                  I can haz feedback?
                  If I owe you feedback, just remind me, as I sometimes forget.

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