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AR-10 (OBR) scope mount - two piece rings ok?

Discussion in 'Rifle Country' started by LoneStarWings, Aug 29, 2016.

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  1. LoneStarWings

    LoneStarWings Member

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    Have a LaRue OBR on order and am researching the optics while I wait.

    Probably going to go with something like a Vortex Razor HD 6-24x if the budget allows, otherwise might default to a Mark 4, anyway a 50mm objective.

    Ay question is can I use two piece rings, like the badger ordnance extra high and still have room (enough rail length) to mount the scope on the upper?

    I don't really want or need QD so I'd prefer just to use simple rings. Also the OBR has a 20 MOA cant built into the top rail. According to some online calculators anyting that mounts the optic centerline at or above 1.25" will clear the rail with a 50mm objective, but I'm not sure exactly what height works best for cheek weld on the OBR/AR-10 pattern rifle.

    It seems like most people that get an OBR just use larue mounts, but they're all "QD" and I don't want that, just want something as solid as possible with the least possibility of wandering zero. I do shoot NTCH on AR-15's but have heard the geometry is different on the AR-10, so don't know if I'd do it there.

    Any help is appreciated.
     
  2. Llama Bob

    Llama Bob Member

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    Couple of things. You can order Larue mounts non-quick detach. On the order page it's listed as "VFZ Mount" under the Mounting Type pulldown. It's cheaper than the quick detach.

    Normal rings of an appropriate height would work fine. The A2 stock they've got on there has no riser, so I would definitely take the lowest rings that would work. If it's my personal rifle that A2 buttstock is coming off in favor of something that can be adjusted though.
     
    Last edited: Aug 29, 2016
  3. FL-NC

    FL-NC Member

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    I use Larue mounts (123 rings) on my OBR. Just because the mounts are q-d doesn't mean you have to use the feature.
     
  4. rjrivero

    rjrivero Member

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    The eye relief is tricky on AR10's. If you have enough eye relief to use rings and you have 20 moa already built into your upper receiver, then I would prefer to go that way.

    Because I have no rise in my upper, I use a mount with 20MOA built into it.
     
  5. z7

    z7 Member

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    Check out the American defense manufacturing. I have a Recon one piece qd mount. Super easy to put the optic in, super easy to move the optic and repeatable zero. I use it on my ar10 primarily but swap it to my other ar's for load development. For one rifle i have a 4moa left, 1/2 moa up adjustment. After i am finished with the ar15 i move the mount back to the ar10 and undo that adjustment and my first shot is where i expected. I know you dont want/need qd function, but the adm mounts are solid, well made, achieve proper eye relief and are repeatable if you need to move it

    Sent from my SM-G900V using Tapatalk
     
  6. bangswitch

    bangswitch Member

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    Like rjrivero said, getting the eye relief right sometimes makes standard rings difficult, the rear one can end up at the very back of the rail, can make grabbing the charging handle cumbersome. I used a Burris P.E.P.R. mount for my Vortex Viper on my AR-15. Lots of room to play with position, and it's a very solid mount. Geissele makes a similar mount that is even more solid, and would be well-suited to the Razor. I had to consider budget, the Geissele mount was 4x what I gave for the Burris (just like the Razor is 3x the Viper). If you can swing the razor, the Geissele mount is pocket change.
     

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  7. LoneStarWings

    LoneStarWings Member

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    I realize the cantilever mount is necessary for eye relief/charging handle use on the AR-15, but on the AR-10 there are 4-5 more rail slots equating to 3-4" more length on the top of the upper, which is why I thought rings might work OK.

    There have been reports of the larue QD mounts not holding zero and/or shooting loose:

    https://pistol-forum.com/showthread.php?15509-LaRue-Mount-Issues/page2
    And this from the owner of another forum:

    I realize it's kind of silly to buy a rifle from them but not a mount, but I've had wandering zero due to mounts before and really really hate dealing with that, especially on a "precision rifle", and on a 7.62 which does knock parts loose a lot easier than 5.56.
     
  8. Bartholomew Roberts

    Bartholomew Roberts Moderator Emeritus

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    I've shot out to 600yds with my Larue mounted optics and never had any issues with zero shift - even after removing and remounting the optic between shots. Having said that, all of that shooting was on intermediate caliber AR15s. Nothing .308.

    Honestly, I'd just explain what you want to Mark Larue and ask him what he recommends. Almost any product will fail in extreme enough conditions.
     
  9. Zerodefect

    Zerodefect Member

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    The Larue mounts are as solid as the bolts on a set of rings. Even more solid possibly. I'm more likely to check the tension on my scope rings before a range day than my Larue mounts.

    Just run the Larue QD mount. Getting the optic off of the rifle makes cleaning so much easier.

    Congrats on the excellent rifle. It might cost as much as an entire engine for my truck, but it's worth it.
     
  10. LoneStarWings

    LoneStarWings Member

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    To be fair my previous wandering zero issues have been with various M14 mounts. That rifle manages to loosen any mount that tries to go in it's scope mounting slot given enough time/rounds.

    Have badger rings on my 700 and it has never had any issues. Maybe I will just try a larue mount on the 7.62 OBR and see what happens. I have an aimpoint mount and cantilever mount of theirs running on 5.56 AR's without issues too.
     
  11. FL-NC

    FL-NC Member

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    I've never had any issues with any Larue mount on any rifle- 5.56, 308, or 300 WM. As long as the ring screws are installed with blue locktite (like any set of rings) and the tension in the throw levers is properly adjusted, no issues. We used these extensively on M4 and MK12 rifles (5.56) M24 and SR25 (308) and MK13 (300 WM), all with very high round counts. Todd Hodnett uses them on his rifles, to include 338 Lapuas, and other magnums and he shoots more than most people.
     
  12. Llama Bob

    Llama Bob Member

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    I ran a larue mount with a USO 1.8-10 in it (pretty heavy scope) for thousands of rounds with no problem on a .308. Pretty sure it'll be fine.
     
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