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Thread: NSR/MUR Drilling Anti-rotation DIY

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    NSR/MUR Drilling Anti-rotation DIY

    I got a 13.5" NSR over the weekend and want to drill my Vltor MUR for the anti-rotation pin the NSR's have. Is there any kind of jig or drawings that show where this hole needs to be? I have the tools and know how needed, just want it to be exact.

    Or would it be best to find an actual Noveske MUR pre-drilled?
    Last edited by Onyx Z; 03-04-13 at 09:09.

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    Where is this pin?

    I put an NSR and Noveske MUR together a few weeks back and don't remember anything about an anti-rote pin.
    "You people have too much time on your hands." - scottryan

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    Quote Originally Posted by markm View Post
    Where is this pin?

    I put an NSR and Noveske MUR together a few weeks back and don't remember anything about an anti-rote pin.
    The pin is hidden, unlike most other manufacturers, and it should have come with the NSR (mine did). Installing the pin is optional, but when used it helps 'lock' the handguard/barrel nut to the upper receiver to prevent the nut from back out.



    Last edited by Onyx Z; 03-04-13 at 09:57.

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    Great topic as I was looking to drill my standard upper for the NSR anti rotation pin.

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    Judging from the photos, there may not be enough room to drill the upper for the pin
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    Wow.. I don't remember seeing the pin. I'll have to look around.

    I'd rather leave it off than drill into my upper.
    "You people have too much time on your hands." - scottryan

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    Quote Originally Posted by MistWolf View Post
    Judging from the photos, there may not be enough room to drill the upper for the pin
    ???????? Judging by the pictures, there's plenty of room to do it. The anti-rotation pin hole is shown in the picture of the MUR receiver.

    Quote Originally Posted by Onyx Z View Post
    From bore centerline, the height to the gas tube hole and to the top of the receiver's rail is the same if it's a MUR or M4 receiver. So by that logic, the hole for an anti-rotation pin would be in the exact same location on a M4 receiver.

    That being said, I have personally drilled the hole on a standard M4 receiver to accept the anti-rotation pin for a NSR. It worked fine and was very simple after the setup in the mill was complete. I don't have the measurements we took anymore but I can give you step by step on how I did everything. If the desire is there, I will post it in this thread, maybe with pictures if you ask extra nice.

    If I had regular access to the machine shop, or if someone wants to buy me a bench top mill, I would gladly do it for anyone who wanted it but I can't foresee either happening in the near future.

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    Quote Originally Posted by MistWolf View Post
    Judging from the photos, there may not be enough room to drill the upper for the pin
    I found the pictures on google, the one on the left is not a true representation of the standard Vltor MUR. The one on the right is a real Noveske marked MUR. A standard MUR is mil-spec forward of the dust cover.

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    Quote Originally Posted by bleaman225 View Post
    ???????? Judging by the pictures, there's plenty of room to do it. The anti-rotation pin hole is shown in the picture of the MUR receiver.



    From bore centerline, the height to the gas tube hole and to the top of the receiver's rail is the same if it's a MUR or M4 receiver. So by that logic, the hole for an anti-rotation pin would be in the exact same location on a M4 receiver.

    That being said, I have personally drilled the hole on a standard M4 receiver to accept the anti-rotation pin for a NSR. It worked fine and was very simple after the setup in the mill was complete. I don't have the measurements we took anymore but I can give you step by step on how I did everything. If the desire is there, I will post it in this thread, maybe with pictures if you ask extra nice.

    If I had regular access to the machine shop, or if someone wants to buy me a bench top mill, I would gladly do it for anyone who wanted it but I can't foresee either happening in the near future.
    Can you post the steps please? I have access to a Bridgeport, I just need the measurements. If it's not just right, the NSR might be canted or may the anti-rotation pin might not fit at all?

    Theoretically, the hole to be drilled in the upper receiver will use the same measurement as the anti-rotation pin hole already in the NSR... it may work on paper, but that doesn't always equate to real life...
    Last edited by Onyx Z; 03-04-13 at 11:51.

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    The NSR 9 that I installed a couple of days ago had the anti-rotation pin in the little bag with the rail screws. The upper on the rifle I installed it on is a Noveske from a couple of years ago and of course wasn't drilled. It strikes me that drilling the receiver would be a pretty critical step and accuracy of the drilling very important if you want the rail on straight. As it is, the only thing that would allow rotation of the upper is if the barrel nut came loose. I torqued it down with 80 ft-lbs, so I doubt that that's likely. The rail that I replaced was a DD Lite 9.0, which also relies only on the barrel nut to keep the rail from rotating. I never had that happen, and reviews of the DD Lite over its market lifetime certainly suggest that it's not likely. I decided not to worry about it.

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