Mp5 extractor spring issue
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Thread: Mp5 extractor spring issue

  1. #1
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    Default Mp5 extractor spring issue

    I'm having issues with my extractor spring and it's driving me crazy, to the point I'm loosing confidence in the gun. I had about 800 rds through the first one and started to get FTE issues and the spring was very loose. Perhaps 100 rds were suppressed.

    Replaced it, went through about 400 rds (some suppressed) and it started to wiggle again (replaced it before I experienced any fte issues)

    Replaced it again and after 150 rds, it's starting to wiggle once more. This last time, I only shot 115 or 124 factory brass cased ammo and not suppressed.

    This last test, I ran only HK mags (all curved) and had zero malfunctions.

    Bolt gap is .018 and gun is less than a year old.
    Also, running the standard locking piece.

    I have an SP5k with over 2000 rds, some suppressed and the spring is still rock solid. Never a single issue.

    The MP5 is a clone (will not name as I'm not brand bashing, but it is one of the top three in the nation) and it has the RCM bolt in it. Could the bolt be causing the issue? Would replacing with factory HK possibly fix it?

    I understand I can replace the spring with a steel rifle spring but that is not correcting the issue, just covering it up.

    I'm stumped

  2. #2
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    Make sure you are following the steps in this video. https://www.youtube.com/watch?v=xEwt_7OJCrA

    If you are still having issues go ahead and step up to the rifle spring.

  3. #3
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    Quote Originally Posted by bauerdb View Post
    Make sure you are following the steps in this video. https://www.youtube.com/watch?v=xEwt_7OJCrA

    If you are still having issues go ahead and step up to the rifle spring.

    Yup, exactly!

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  5. #4
    Teufelshund Tactical
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    Quote Originally Posted by bauerdb View Post
    Make sure you are following the steps in this video. https://www.youtube.com/watch?v=xEwt_7OJCrA

    If you are still having issues go ahead and step up to the rifle spring.
    Man, that guy sure knows his stuff.
    SF,

    James

    Heckler and Koch Certified Armorer (Heckler and Koch)
    Heckler and Koch Pistol, Submachine Gun and Rifle Instructor (Singleton International)

    Owner, Teufelshund Tactical

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  6. #5
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    Problem is, using the steel spring doesn't fix the actual issue. I'd like to understand what the cause is.

    I'm sure HK doesn't have to use the steel springs in thier full autos.

  7. #6
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    Quote Originally Posted by Marine0303 View Post
    Man, that guy sure knows his stuff.
    James,

    So, how would you address this issue?

  8. #7
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    Quote Originally Posted by Mravery View Post
    James,

    So, how would you address this issue?
    Could be lots of issues when dealing with clones. I have a video on my channel covering bolt gap that explains this a bit deeper.
    Without having it on my workbench to see for myself, I'd recommend contacting the builder/manufacturer and get them to sort it fo you.

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