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Thread: JJ barrel wont work

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  1. #1

    JJ barrel wont work

    I just dusted off my mini-mag (hyper-mag regulator) that has been sitting in my closet for about 10 years, and I did the level 10 tune up with all new internals and spring, as well as putting all new o-rings and seals on regulator. After working with it and getting no leaks I decided to shoot some paint and chrono. Imagine my surprise (and frustration) when I put on my JJ barrel and it wouldn't fire. If i pull the barrel out a bit, then it fires. I had no problems using a smart parts barrel or armson barrel. Any thoughts? Anyone have a similar experience?
    P.S. I did try all of the springs and adding shims.

  2. #2
    Try taking the bolt off the valve and dropping it in the barrel. Maybe its a tight bore barrel?

  3. #3
    will try that tomorrow. Thanks.

  4. #4
    Join Date
    Feb 2008
    Location
    Boulder, Colorado
    Posts
    1,038
    the lvl 10 bolts can get thicker around the tip (best way to say it, honest) after a while, if it doesn't slide into the barrel easily just get some sand paper

  5. #5
    Mine had the problem described by binumber. I had to sand the bolt a little and the body washer inside my emag body. A lvl7 bolt would fit but not lvl10.

  6. #6
    Join Date
    Jan 2002
    Location
    Halifax, N.S., Canada
    Posts
    8,039
    Quote Originally Posted by BiNumber3 View Post
    the lvl 10 bolts can get thicker around the tip (best way to say it, honest) after a while...
    LOL. They don't get thicker as they sit around. The stainless steel doesn't absorb moisture and swell up.

    A small bore barrel can cause problems with a level 10 bolt due to it having a wider tip. The recommended minimum size barrel bore to use with a level 10 bolt is 0.685".

    Another potential problem is if the outside of the barrel is slightly smaller diameter. This can cause the barrel to sometimes get pushed off center by the twist lock assembly. If this happens, then the bolt will rub on one side of the barrel and prevent operation. You can correct this one by wrapping some tape around the back of the barrel to artificially make it bigger so that it stays properly centered. Do it in two locations(forward and back) so that you don't get barrel wobble.
    Except for the Automag in front, its usually the man behind the equipment that counts.

  7. #7
    Join Date
    Feb 2008
    Location
    Boulder, Colorado
    Posts
    1,038
    didn't mean from sitting think I read somewhere that they start mushrooming from use or something to that effect

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