AR-10/AR-15 difference?

Discussion in 'AR-15 Discussion' started by ExarKun, Jul 13, 2011.

  1. ExarKun

    ExarKun New Member

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    Hello,

    Besides of the different caliber, what are the other technical differences of the AR-10 compared to the AR-15?

    I ask this question in this sense:

    I would like to mount the Magpul .308 PRS in my HK MR308 (it is called MR762 in the US, I guess).

    In a german forum one guy said, that the PRS uses the same buffer tube like the AR-15. But is that possible? Due to the "bigger" caliber of the AR-10, the receiver has to be more massive, therefore the buffer tube must be wider in its diameter and the buffer spring of the AR-15 should be too weak to make the AR-10 receiver slide forward again.

    Has anyone already tried to mount an PRS on the MR308 (IF possible)?

    Regards

    ExarKun
     
  2. mjkeat

    mjkeat New Member

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    I am not up on AR10 style rifles but I do know you can use .308 receiver extensions on AR15s. That leads me to make the ***umption that you could mount a PRS on an AR10 style AR.

    Someone will be along shortly w/ a more concrete answer.
     

  3. ExarKun

    ExarKun New Member

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    Hello,

    Yes, you can usw .308 receiver extensions on the AR-15, because the AR-15 and the AR-10 use both a mil-spec buffer tube.

    Thats what I read in an other forum.

    And there lies the problem. The buffer tube of my MR223 is 30mm in diameter, so I can Install i.e. the UBR Stock on the MR223.

    The MR308 has a 35mm buffer tube and the question is: does the PRS .308 also have a buffer tube in this diameter?

    I fear not.

    Any different opinion?
     
  4. neilage66

    neilage66 New Member

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    AR15 = scaled down AR10

    The only difference in the PRS stock body is the length of the cheek riser.
    The riser on the AR10 version is shorter to accommodate the longer charging handle stroke.

    There are many variations of buffer and spring to choose from depending on your upper.
     
  5. dnthmn2004

    dnthmn2004 New Member

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  6. ExarKun

    ExarKun New Member

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    @ neilage66 @dnthmn2004:

    Thank you, but I knew all that before. The most important question for me is: does the AR-10 also have a mil-spec buffer tube, or has the AR-10 buffer tube a bigger diameter?
     
  7. neilage66

    neilage66 New Member

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    From ArmaLite faq:
     
  8. JonM

    JonM Moderator

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    There is no milspec standard for ar10 as it has never been adopted by any military. Each parts manufacturer pretty much designs their own. So any cross use between different platforms is purely hit or miss. With non-milspec there is often fitting required to make some things work. Even with milspec swapping parts is sometimes an issue altho the ar15/m16 suffers from this less than most.

    My opinion:
    With ar10 you should treat them as a sole standalone rifle regardless of its cosmetic similarity to the ar15
     
  9. neilage66

    neilage66 New Member

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    Your statement does not paint the full picture in regards to the AR10.

    The AR10 has been purchased and used (albeit in limited quantities) by the armies of Guatemala, Burma, Italy, Cuba, Sudan, Portugal, Canada and the United States.

    Does this mean it was *not adopted*...yes and no. ;)
     
  10. JonM

    JonM Moderator

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    The remington 700 falls under that as well but there is no milspec standard. When i said adopted i meant as a country's main battle rifle.
     
  11. neilage66

    neilage66 New Member

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    I think the label we're looking for is *limited issue*.