Modifying Upper for M-LOK
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Thread: Modifying Upper for M-LOK

  1. #1
    Newbie Biff1212's Avatar
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    Modifying Upper for M-LOK

    Just finished milling off the side and bottom rails on my XCR. I'm just waiting for the specs on the M-LOK slots before I turn this thing into swiss cheese.
    Modifying Upper for M-LOK-wp_20170119_16_00_20_pro.jpgModifying Upper for M-LOK-wp_20170119_16_00_32_pro.jpgModifying Upper for M-LOK-wp_20170119_16_37_03_pro.jpgModifying Upper for M-LOK-wp_20170119_17_18_10_pro.jpgModifying Upper for M-LOK-wp_20170119_17_30_05_pro.jpg
    Merlin likes this.

  2. #2
    XCR Guru navalbeaver's Avatar
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    M-lok needs a flat surface on the inside doesn't it?

    I'm sure you'll be able to tighten the nuts down enough to get a grip "tight" but is it just going to be digging into the inside of the curved surface in the barrel channel?

  3. #3
    Newbie Biff1212's Avatar
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    I'm going to be machining the inside flats once I get the specs for the slots

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    XCR Guru navalbeaver's Avatar
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    Sweet.

    Good luck.

  6. #5
    Carbineman trebor's Avatar
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    m-loc specs

    Quote Originally Posted by Biff1212 View Post
    Just finished milling off the side and bottom rails on my XCR. I'm just waiting for the specs on the M-LOK slots before I turn this thing into swiss cheese.
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    The specs are on the Magpul web site.

  7. #6
    Newbie Biff1212's Avatar
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    Quote Originally Posted by trebor View Post
    The specs are on the Magpul web site.
    Link? All I see is a PDF with info and basic dimensions for slot size. I do not see any manufacturing specs.

  8. #7
    XCR Guru WatchoutforStobor's Avatar
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    For something that is supposed to be open source, it sure is hard to find the specs.

    This guy used a 3/16 end mill for the radiused corners

    M-Lok Dimensions - AR15.COM

  9. #8
    Newbie Biff1212's Avatar
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    Quote Originally Posted by WatchoutforStobor View Post
    For something that is supposed to be open source, it sure is hard to find the specs.

    This guy used a 3/16 end mill for the radiused corners

    M-Lok Dimensions - AR15.COM
    I saw that thread too. Was hoping for some better drawings..... contacted Magpul haven't gotten a response.

  10. #9
    XCR Guru fmunk's Avatar
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    Quote Originally Posted by Biff1212 View Post
    I saw that thread too. Was hoping for some better drawings..... contacted Magpul haven't gotten a response.
    You probably won't due to SHOT. And even afterwards, I'd be surprised if you do at all. It's open source to manufacturers so they can gain marketshare, sell more accessories and get free advertising. Naturally, individual smiths trying to make one-offs won't be their priority.

    Probably better off breaking out a pair of precision calipers and start measuring.
    Fool-proofing serves only one purpose: identify bigger fools.

  11. #10
    Newbie Biff1212's Avatar
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    Quote Originally Posted by fmunk View Post
    You probably won't due to SHOT. And even afterwards, I'd be surprised if you do at all. It's open source to manufacturers so they can gain marketshare, sell more accessories and get free advertising. Naturally, individual smiths trying to make one-offs won't be their priority.

    Probably better off breaking out a pair of precision calipers and start measuring.
    I agree with you. I should have my M-LOK rails on Monday. I'll tinker with a piece of flat bar until I get the fit right. If everything works out I'll cut up my upper.

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