Macdev Prime XTS Leak

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  • Eddmontonia
    Rockin and Cockin
    • Feb 2026
    • 34

    #1

    Macdev Prime XTS Leak

    I got a Prime XTS here that seems to be leaking by the solenoid after trying to rule out just about every other option, but I could be missing something. I didn't have any issues using it for a day with velocity that I could tell but it went through air pretty quick (about 2k psi after 4 pods on a 550 output 80ci tank). When I gas it up I can hear a small leak around the middle of the solenoid area or to the right of it at the top of the grips. The leak will go away after some moments but returns when cycling the marker. Here's what I've tried replacing so far -

    - Infinity drive o rings including both internal keg rings, both bolt o rings, valve seal o ring, and outside static o rings
    - HPR seat and piston o ring
    - checked and changed air transfer seal on upper receiver
    - checked and lightly greased gasket on solenoid
    - Opened solenoid and cleaned/greased spool inside

    Not sure if it could be something with my tank regulator, but its not leaking that I can tell and I used it all day yesterday with my Etek 5 without issue. I've included pics if they prove useful. Not sure if this will tag right but I've heard Mr imped4now may be a good reference point
    imped4now
    Attached Files
  • imped4now
    Bunker Buster
    • May 2021
    • 178

    #2
    Thanks for the tag. The large solenoid spool seal is a 6x1mm...change that and report back. If you have any PE spools, they *should* have a 6x1 baggy in the parts kit.

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    • Eddmontonia
      Eddmontonia commented
      Editing a comment
      Thank you and will do! Was able to get in contact with a US macdev guy who said he could get me those o rings so hopefully that'll be just what I need
  • Eddmontonia
    Rockin and Cockin
    • Feb 2026
    • 34

    #3

    Unfortunately still getting the leak near it and it appears to be worse after replacing the spool o rings on the solenoid. I tried replacing all three of them and I don't see any damage to them that I can tell. I have another small red one I can try with but not really sure where to go from here....
    imped4now

    video of leak now - https://imgur.com/a/PIiEBbB
    Attached Files
    Last edited by Eddmontonia; 09-01-2026, 02:19 PM.

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