Flash Port Leak

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  • CatFarmers
    MCB Member
    • Dec 2024
    • 156
    • Coastal NC

    #1

    Flash Port Leak

    Hello all,

    I have googled and dug through the all parts of internet I can at this point.

    I rebuilt this A4 Fly ?late last year?, used it a few time got it out and stretched its legs, no issues. Recently it started leaking out of the flash port, well put it away and have been spending about 30 to 45 minutes here and there trying to figure the issue out. Here is what has been done:
    -Changed the the VASA/flashport Oring
    -Cleaned and changed the oring on the LPR piston
    -Removed the LPR, inspected, cleaned, changed orings.
    -Verified starting pressure from th CP Regulator @ 200 PSI
    -Tank input verified @ 450

    To note: I can reduce reg pressure until velocity is around 200 FPS and the leak stops, I can also increase velocity until I hit 320ish FPS and leak stops. Either way gun shoots great.

    I definetely appreciate any help you all can provide.

    -Cat

    Click image for larger version

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  • superman
    MCB Member
    • Jul 2020
    • 3379
    • Mount Pleasant, SC

    #2
    pretty sure it is the lpr reg seat if i remember correctly.
    BeardedWorks.com (Your Inception Designs and Shocktech Dealer)
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    • CatFarmers
      CatFarmers commented
      Editing a comment
      Here is the "main seal". Im not sure what the A4 variants are supposed to look.
  • CatFarmers
    MCB Member
    • Dec 2024
    • 156
    • Coastal NC

    #3
    Main Seal

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