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Thread: Bolt assembly and bolt gap instructions

  1. #11
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    I just checked my MP5k bolt gap and it is .30 mm

    Gun works perfectly so is this a good enough bolt gap or should I try to adjust?

    Thanks, Seth

  2. #12
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    Quote Originally Posted by swiss_seth View Post
    I just checked my MP5k bolt gap and it is .30 mm

    Gun works perfectly so is this a good enough bolt gap or should I try to adjust?

    Thanks, Seth
    Proper bolt gap is ideally .25-.45mm, and can go to a maximum of .5mm. Yours is getting on the low end, but is ok for now. You've got about .002" of wear left until you're at the minimum. I'd get some new rollers.

  3. #13
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    Thanks Buddy

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    So just to check I should put in a 8.02 rollers

    Right now I have the standard unmarked rollers.

    That would raise the bolt gap to .40 mm

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    Quote Originally Posted by swiss_seth View Post
    So just to check I should put in a 8.02 rollers

    Right now I have the standard unmarked rollers.

    That would raise the bolt gap to .40 mm
    Yep, that is correct, each step up raises the gap .1mm. The locking piece head can also wear, and is easily replaced. The last wear point is the trunnion, which is obviously not easily replaced. But in your case, all you need is the rollers because you're not even out of acceptable spec.

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    Great info and THANKS from a newbie. I just checked my MP5 clone and maybe found out why my failure to cycle problems. My gap is about .025 " . Time to try some new rollers also.

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    Quote Originally Posted by wizard78 View Post
    Great info and THANKS from a newbie. I just checked my MP5 clone and maybe found out why my failure to cycle problems. My gap is about .025 " . Time to try some new rollers also.
    Hold off on those rollers for now. If your gap is .025", you have other problems. Are you sure the bolt was fully closed? Did you drop the hammer on the empty chamber?

    As the parts wear, the gap gets smaller, not larger. The oversized rollers increase the gap size, not reduce it.

  9. #18
    tebbetts
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    I'd like to know if there is a published source or book that has these instructions. Are they any different for the SL7 rifle? Bolt gap listed in the owners manual is 0.1mm.
    Thanks for any info.
    tebbetts

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    Default pics?

    What happened to the pics?

  11. #20
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    The pictures are broken for me as well. Does someone have them? If so I can post them on my web space.

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