No substitutes: Polyurethane just can't be replaced.

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  • GoatBoy
    Junior Mint
    • Jun 2003
    • 1399

    #46
    Originally posted by Spider-TW
    I have a buna example that is documented in two different threads. The problem appears to be shelf life, not so much lube or number of shots.

    At the end of March 2009, I put my EP mag into service with a quad (buna) on/off top o-ring. In May of 2012, I had a failure of that o-ring, after more than 20k cycles. Fair enough. I had bought the set of four from the AGD store, so I installed a spare and went back to play. That one lasted less than 100 shots. I found the new one had wadded up in the on/off, and the other two (unused, stored clean, out of the sun and dry) had lost their elasticity also. I dug out some ancient, unknown teflon top o-ring and a longer on/off pin, problem solved.
    I must have overlooked those threads. I did try to mention the shelf life issue as it is something I have noticed as well.

    20k is a good number. I put about 300 more through mine today.
    "Accuracy by aiming."


    Definitely not on the A-Team.

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    • GoatBoy
      Junior Mint
      • Jun 2003
      • 1399

      #47
      Put another 300 through the gun today; everything's still working just fine.

      I'm going to dub this gun the "Bunamag".
      "Accuracy by aiming."


      Definitely not on the A-Team.

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