DD MK18 12” RISII

Discussion in 'General Accessory Discussion' started by Magpul1, Oct 29, 2020.

  1. Magpul1

    Magpul1 New Member

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    Where can I purchase I cannot find it anywhere in stock online. Please help.
     
  2. Guges Mk3

    Guges Mk3 Well-Known Member Supporting Member Lifetime Supporter

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    Not currently being made.

    Most products are in "batches" and this has been off production for awhile.

    Another issue is the AEG. Which AEG are you looking to mount this on if you find one?
     
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  3. Magpul1

    Magpul1 New Member

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    Huntington
    I’m actually looking to put this on an LM4
     
  4. Guges Mk3

    Guges Mk3 Well-Known Member Supporting Member Lifetime Supporter

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    Depending on the rail kit...that nut may not fit.
     
  5. aotsukisho

    aotsukisho Well-Known Member

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    The Mk18 uses a 9.55" rail. The 12" rail you're talking about (actually 12.25") is for the older 14.5" M4A1 Block II carbine before the CQB-R was adopted. Ebay actively takes down listings for handguards/rails now, so your only option will likely be a firearms-specific P2P hub like Armslist or similar.

    You will probably need a die in order to rethread the LM4 receiver, 1-1/4x18tpi for AR-15 spec barrel nuts.
     
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  6. yrutimid

    yrutimid Active Member

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    the rail does fit lm4s. i had a friend put one on his lm4. i dont remember him complaining about fitment. only thing he complained about are the mags of the lm4.
     
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  7. Guges Mk3

    Guges Mk3 Well-Known Member Supporting Member Lifetime Supporter

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    And which DD kit was that?
     
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  8. Magpul1

    Magpul1 New Member

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    Huntington
    Yes I’ve heard the same that’s why I addressed this topic
     
  9. Gimpalong

    Gimpalong Member

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    Madbull's DD RIS II rail was originally made to metric specs to fit the receivers threads cut on TM-style M4 receivers. At some point, Madbull did make a version that was designed to fit both imperial (G&P, ICS) and metric (TM, CA) receivers. I only learned about this because I PMed them on FB trying to get some answers about fitting a Madbull RIS II. I have personally put a Madbull RIS II on both a G&P as well as a Tippmann M4 with no issues. Even if you buy a Madbull Mk18 or RIS II rail and the barrel nut won't thread on, you can use the nut as a die to re-cut the threads on your receiver. You just need to go slowly and tighten the nut on and then back it off as you go. Otherwise, you could try find the die that Madbull made to re-thread receivers to imperial spec, but good luck with that if you can't even find the Madbull rail itself.

    It's also worth noting that a bunch of other companies now make both RIS II and Mk18 rails.
     
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  10. yrutimid

    yrutimid Active Member

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    he said he doesnt remember. If i remember correctly he sold it to a guy with an aeg, so it was probably and madbull one. i will try to fish more info out of him

    EDIT: he said he got it off another gun he bought.
     
  11. CacheFlow

    CacheFlow New Member

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    Slightly in the weeds...

    I mean; if you're really hard up you can always have someone 3D print you one in PLA (even include custom markings/rails/etc) and do a "lost wax cast" style pour with melted aluminum cans, or I've had excellent success with melting spent Co2 capsules. You've got to clear off some muck from either option before you cast, but I've made some functional cosplay items that way with great results, and it's a lot easier than it sounds. (Great YouTube tutorials & how I learned)

    Obviously easier to just find/buy it...but remember there are options to acquiring exactly what you want beyond "retail". I have a couple blaster builds this winter, one is the DL-44 (Han Solo's) into a functioning airsoft pistol. I'll journal it just in case you still haven't found your DD by then. I have to cast some parts that aren't machinable.

    Sorry for the rant and good luck!

    -Cache
     
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  12. Guges Mk3

    Guges Mk3 Well-Known Member Supporting Member Lifetime Supporter

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  13. CacheFlow

    CacheFlow New Member

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