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Thread: Runaway Mag

  1. #1

    Unhappy Runaway Mag

    Problem here.

    My mag is running away on full auto as soon as it's gassed up. Even on safe.
    Took it apart to inspect, and noticed the sear catch was bent. The end facing the valve.
    Straightened it, but it didn't seem to fix the problem.

    Another thing I noticed: Usually when removing the valve after you've removed the field-strip screw, you have to press trigger to hear that little click to release the valve. Doesn't do that with the zgrip. What's going on here?

  2. #2
    Join Date
    Oct 2001
    Location
    Plymouth, WI
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    7,029
    2 things, trigger rod gap?

    look at your sear and on/off orings for wear

    post pics

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  3. #3
    Quote Originally Posted by BTAutoMag View Post
    2 things, trigger rod gap?

    look at your sear and on/off orings for wear

    post pics
    Any specific pictures I should be taking? The on/off o-rings look fine.

  4. #4
    Join Date
    Oct 2006
    Location
    Houston, TX
    Posts
    3,132
    make sure your on/off pin is still the right length. They can break off at the bottom and look right from either end, just too short.

  5. #5
    Join Date
    Jan 2002
    Location
    southern IL
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    1,719
    Quote Originally Posted by TyeStick View Post
    Any specific pictures I should be taking? The on/off o-rings look fine.
    With the marker aired up. How much gap is there? If any. Between the trigger rod and the trigger. Should ba about a credit card thickness.

  6. #6
    Quote Originally Posted by Spider-TW View Post
    make sure your on/off pin is still the right length. They can break off at the bottom and look right from either end, just too short.
    Thanks for the info. I did check my on/off earlier today but may have overlooked the pin being broken off. Although, when checking the on/off pin here at the house, the broken piece fell out. I'm not sure if it JUST snapped when I was home, or if it was already broken from yesterday, and the piece just finally fell out.



    Here's some shots of my sear…





    Quote Originally Posted by blackdeath1k View Post
    With the marker aired up. How much gap is there? If any. Between the trigger rod and the trigger. Should ba about a credit card thickness.
    I can't really tell when it's aired up... It's shooting/dry firing.

  7. #7
    Join Date
    Oct 2013
    Location
    Dayton OH
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    174
    Quote Originally Posted by TyeStick View Post
    [regarding rod gap]I can't really tell when it's aired up... It's shooting/dry firing.
    measure the length with a pair of calipers. rod length (total length from tip of rod to where it connects to the sear) should be 1.945" for RT, and 1.998" for RT Pro / AM / MM.

  8. #8
    Join Date
    Mar 2009
    Location
    Massassachussessetts
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    3,181
    Quote Originally Posted by Cyco-Dude View Post
    measure the length with a pair of calipers. rod length (total length from tip of rod to where it connects to the sear) should be 1.945" for RT, and 1.998" for RT Pro / AM / MM.
    It's broken in half LOL

  9. #9
    Quote Originally Posted by Frizzle Fry View Post
    It's broken in half LOL
    1+1

  10. #10
    Join Date
    Jan 2002
    Location
    southern IL
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    1,719
    Quote Originally Posted by Frizzle Fry View Post
    It's broken in half LOL
    The sear is not broke in half.

    But yes. The ON/OFF pin is.

  11. #11
    Join Date
    Oct 2009
    Location
    McHenry, IL
    Posts
    485
    Quote Originally Posted by Frizzle Fry View Post
    It's broken in half LOL
    I believe he's referring to the trigger rod and not the on/off pin.

  12. #12
    Join Date
    Oct 2006
    Location
    Houston, TX
    Posts
    3,132
    Quote Originally Posted by TyeStick View Post
    I'm not sure if it JUST snapped when I was home, or if it was already broken from yesterday, and the piece just finally fell out.
    The o-ring in the body of the on/off may have held it in place before. The length of the two pieces should be 0.750". You could be missing a third small section that came off first.

    The sear itself looks fine (as usual).

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