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Thread: Good way to mount an AR scope LOWER?

  1. #1

    Good way to mount an AR scope LOWER?

    Is there a good way to mount a low power variable scope at approximately 1.25" to centerline on an AR? Or even very slightly less?

    Most of the one piece mounts are 1.5" or higher, and I find that to be too tall for an optimal cheek weld, personally. It is even worse for my young daughter. She only gets a marginal jawline weld. I can see the utility if you are trying to go over the top of BUIS, have a giant 50mm objective lens, or have a relatively large/thick head/face. Using traditional rings seems like it would push the optic back to the rear quite a bit?

    I'm thinking about a simple, lightweight BCM ELW-F upper with nothing else mounted on it. Just a lightweight LPV optic that's mounted lower to optimise cheek weld. And a sling.

    Are there any good, lightweight options for doing this?

  2. #2
    Site Supporter texasaggie2005's Avatar
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    If you want a unimount, Nightforce has one at 1.125"; $252 at Primary Arms.

  3. #3
    Site Supporter Clusterfrack's Avatar
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    I wouldn’t go lower than Full Co-Witness. That’s a very versatile scope height that works standing, prone, and awkward positions too.

    BTW, that BCM ELW fluted is my favorite upper.
    "BJJ is sort of like nonconsensual yoga"
    "You don’t really graduate from certain problems or certain things… like you always have to work on trigger control and pulling the trigger straight. " --Ben Stoeger 1/24/2018

  4. #4
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    Your desired height is kinda in no man's land. But, if traditional style rings work for scope positioning, some of the see through scope rings are your requested height.
    https://www.midwayusa.com/product/14...er-style-rings

    These are a little lower.
    https://www.midwayusa.com/product/23...-extended-ring

    https://www.midwayusa.com/product/14...le-rings-matte

    These one piece mounts are lower than 1.5", but slightly over the 1.25" requested height. However, the ADM has extension for ease of scope positioning.
    https://www.midwayusa.com/product/10...ral-30mm-rings

    https://www.midwayusa.com/product/26...flat-top-matte

  5. #5
    Site Supporter critter's Avatar
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    Perhaps another option to consider... LaRue Tactical makes a cheek riser that is spring loaded (moves back) so that it doesn't block the charging handle. I know it attaches to the CTR stock. Perhaps others as well. Raising the cheek combined with co-witness height may work for her as she grows into the standard weapon configuration.

    ETA: since it doesn't block the charging handle, any height padding could be rigged on for a perfect fit.

    ETA 2: Correction of an error, not Magpull - it's LaRue Tactical who makes it.

    It's called the R.I.S.R. model LT748-BLK is the black one.
    Last edited by critter; 06-13-2018 at 12:32 PM.
    God is not on the side of the big battalions, but on the side of those who shoot best. - Voltaire

  6. #6
    I just broke out the calipers and figured out that the SWFA mount I've been using is sitting 1.5925" from top of the rail to center of scope. That's higher than I thought.

    My Troy fixed front sight sits at 1.375" (off the BCM KMR rail to the tip of the post as it came set up from the retailer). That is the better part of 1/4" right there.

    The Niteforce Ultralight Unimount that texasaggie2005 linked above also comes in a 1.375" and 5.2oz. They also make a 'Unimount SR', which stands for service rifle, that is 1.35" to center and 5.2 oz. It has a more dramatic cantilever and was designed for being able to accomodate 'nose to charging handle' head position.

    I had to call up customer service at Niteforece to find the weight, as I couldn't find it listed anywhere online. They had to request the information from engineering and call me back. In speaking about the issue with the Rep (who was EXTREMELY helpful and prompt, by the way), I found out that, many years ago, they used to do special runs of mounts for the Military that were specifically specced out to 1.265". He said he thought some of them went to the SEALs, or some such. Pretty interesting, and it really mirrors my ideas about what would be optimal height for a scope on an AR.

    Does anybody know if there is a standard specification for the tip of the front sight over the plane of the flat top receiver? I'd be curious to know this.
    Last edited by frozentundra; 06-13-2018 at 02:21 PM.

  7. #7
    Quote Originally Posted by critter View Post
    Perhaps another option to consider... LaRue Tactical makes a cheek riser that is spring loaded (moves back) so that it doesn't block the charging handle. I know it attaches to the CTR stock. Perhaps others as well. Raising the cheek combined with co-witness height may work for her as she grows into the standard weapon configuration.

    ETA: since it doesn't block the charging handle, any height padding could be rigged on for a perfect fit.

    ETA 2: Correction of an error, not Magpull - it's LaRue Tactical who makes it.

    It's called the R.I.S.R. model LT748-BLK is the black one.
    This product's existence goes to show that quite a few people feel the same as I do about their cheek weld on the AR platform.

    It just seems crazy to me to add all that weight when you could accomplish the exact same thing by simply making the mount a tiny bit lower (thus fractionally lighter). And without worrying about potentially mucking up the charging handle operation.

  8. #8
    Site Supporter texasaggie2005's Avatar
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    Quote Originally Posted by frozentundra View Post
    ... Does anybody know if there is a standard specification for the tip of the front sight over the plane of the flat top receiver? I'd be curious to know this.
    1.41" above flattop, I believe.

  9. #9
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    Quote Originally Posted by texasaggie2005 View Post
    1.41" above flattop, I believe.
    The PLATFORM where the flat top AR front sight is mounted is supposed to be 1.98 inches above the top surface of the barrel. Where the tip of the front sight is will depend on what detent click it's set on in its channel.
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  10. #10
    Site Supporter texasaggie2005's Avatar
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    Quote Originally Posted by Wayne Dobbs View Post
    The PLATFORM where the flat top AR front sight is mounted is supposed to be 1.98 inches above the top surface of the barrel. Where the tip of the front sight is will depend on what detent click it's set on in its channel.
    Forgive my ignorance, but wouldn't the barrel's profile (HBAR, med-con, LW, etc) affect the 1.98"?

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