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Thread: AR10/.308 AR Build knowledge thread.

  1. #31
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    The extension is compatible. The A5 system, spring and buffer, are not.
    Justin

  2. #32
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    Quote Originally Posted by n517rv View Post
    I'm confused by your post. Can you clarify if there is a Vltor A5 model that will work with the Aero Precision M5 308? According to AP, they are a DPMS patterned 308.
    The "system" isn't compatible (system consisting of A5 RE, A5/M16 rifle spring, and longer A5 buffer).

    The A5 receiver extension IS compatible assuming the rest of the buffer system components you use are AR-10 pattern.

    You can use an AR-10 buffer system on LR308 receivers.

  3. #33
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    Thanks for the clarification.

    Sent from my SM-G900P using Tapatalk

  4. #34
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    Good stuff guys - as I said hoping to get this comprehensive thread that perhaps results in someone being able to build a current comprehensive compatibility chart.
    Looks like we're well on our way.
    Here's a tidbit I found - chart and all.


    http://loadoutroom.com/11070/tuning-...art-one-rifle/


    https://spreadsheets.google.com/pub?...en&output=html
    Per Ardua ad Astra.
    STS - gone but not forgotten.

  5. #35
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    Quote Originally Posted by SeriousStudent View Post
    Sweet baby Jebus, $225! Even considering it is a stripped upper, that is a steal.......
    I know - and it seems to be an ongoing deal.
    Spent more on a Noveske Gen2 lower (and there's some others out there as well exceeding that by a length).

    Now granted, fer suuuuure.... - Noveske has some of that "NSU™( Noveske Special Unobtanium™) in it.
    (All bs aside though - it is a kick-ass lower.)
    Per Ardua ad Astra.
    STS - gone but not forgotten.

  6. #36
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    Quote Originally Posted by polydeuces View Post
    Good stuff guys - as I said hoping to get this comprehensive thread that perhaps results in someone being able to build a current comprehensive compatibility chart.
    Looks like we're well on our way.
    Here's a tidbit I found - chart and all.

    https://spreadsheets.google.com/pub?...en&output=html
    That chart has MANY errors... I would avoid it. For example, Aero Precision and Sig 716 uppers are LR308 pattern, NOT AR-10.

    It also doesn't distinguish between AR-10A and AR-10B (classic AR-10 pattern).
    Last edited by Plasman; 11-10-14 at 11:50.

  7. #37
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    As said above, that chart has errors. First line about aero is wrong

    http://aeroprecisionusa.com/aspx/sto...l.aspx?pid=185
    "Works with standard DPMS 308 components and magazines"


    Ha... the further I read the more it becomes. Armalite AR10 (original) does NOT use SR25 components.

    Wow lol. Never look at that chart again its very very incorrect. lol

  8. #38
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    Thanks - good to know - one more reason to do this.

    Still hoping someone can give me a bit of input on the BCG - is there a particular one that should be considered? - or will any work with the given upper/barrel set-up.
    Also my preference goes to a Carpenter 158 bolt, many are listed with 9310, not convinced of that being all that great.

    Does anyone have experience running a rifle RE set-up, and would there be advantages to that?, comparable to doing this on the AR15.
    THX.
    Per Ardua ad Astra.
    STS - gone but not forgotten.

  9. #39
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    I have a fixed MOE rifle stock on my MaTen. I wasn't getting good enough sight picture with my MOE collapsible with my Bushnell Elite Tactical ERS. The eyebox is pretty small on that scope and I needed the extra length. I actually still had to add the largest PRS butt pad to give even more length. That, and I never ever collapsed the stock. But if one were to end up with a monolithic set up then that wouldn't be an issue since you could just move the scope forward. I think a real common stock for AR308s is the PRS. I think a lot of guys when they go down this road they are going for a precision gun and the PRS will give much more versatility with their optic setup than some collapsible options. I have an AR10 PRS (the comb riser is shorter than the AR15) and I took it off without ever firing a round. It made the assembled lower (took it off before I even had the barrel) so heavy that I decided it wasn't for me. I wasn't looking for a 20 pound gun lol.

    As to your BCG question:
    The BCM gunfighter charging handle is compatible with both AR10 and AR308 pattern carriers. So that leads me to believe that their length is very similar if not identical. However their bolts are different. So you need to match your bolt to your barrel.

    Armalite bolts are made from 8620.
    http://www.armalite.com/ItemForm.asp...8-8f26512df4ae

    8620 is obviously not milspec and I guess has had problems. (I have an Armalite BCG with my Noveske barrel in my MaTen)
    http://www.ar15.com/forums/t_3_118/6...teel_bolt.html

    DPMS brand bolts are made of Carpenter 158 with the carrier being made of 8620 (see specs in link below)
    http://www.brownells.com/rifle-parts...prod43843.aspx
    Rainier has these also, and I think they're a site sponsor so shop there. Ok looking at Rainier... they're in the middle of a site upgrade and my account seems to be gone and their site seems to be in flux... so.... maybe not there, or at least not today.

    What's interesting is that JP sells low mass BCGs that are 9310 for somewhere around $450. JP doesn't really sell crap, but if they're wanting to move some products and C158 is unavailable, I could only imagine that they would go with the next best thing. But it is only just that, and not the actual spec.
    https://www.m4carbine.net/showthread...er-158-Vs-9310
    https://www.m4carbine.net/showthread...highlight=9310

  10. #40
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    As far as barrels go you could go with Ranier. They use DPMS pattern barrel extension and the go with the DPMS BCG I listed above from Brownells.

    Since you're trying to stay under a $1000 budget I won't suggest Lilja, but you could go with Lilja. I'll put the link here for others anyway.
    http://www.riflebarrels.com/products/ar_10.htm

    I also noticed that the Aero upper uses DPMS high profile. There are 2 DPMS pattern handguards. The high profile is the older version and is 3/16" tall and the low profile is the new version and is 1/8" tall.

    OMG... I always use Rainiers site for this because they HAD an easy way of showing this and shopping for it, but now... the site is not as good as it was. The link for the pdf from Troy with pictures showing the difference is also not working from them anymore...

    Anyway, another thing to match, hooray. Make sure you're handguards are the same as your upper. Verify once you get yours. Above where the charging goes into the upper, the rear round section where the charging handle fits into the upper, you can measure the thickness. 1/8 = low, 3/16 = high. Get the matching rail. According to the description on Rainiers site the high is the standard profile, so if it isn't specified, I guess its high. But I would definitely call before ordering and verify the profile.

    Check the description
    http://www.rainierarms.com/troy-battlerail-trx-308-7-4

    Daniel defense doesn't say that it works with any particular one, but that its compatible with all of them but
    Although most users do not have issues with compatibility, there have been some changes to the designs of certain .308 AR platforms. Therefore it is important to note that this rail system is designed to line up perfectly with upper receivers which have a top rail that is 1.325” from the bore’s centerline. Some .308 AR platforms have changed the height of the top rail on their upper receivers as well as the thread pattern of the barrel nut. If you are unsure of compatibility, please contact the manufacturer of your firearm and confirm rail height and barrel nut style.
    https://danieldefense.com/rail-syste...2-0-rifle.html

    So I guess they sell different barrel nuts for AR10 and DPMS patterns but their disclaimer above is to cover them with the 2 different DPMS rail heights.

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