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5.56 SPR Mk 12

Discussion in 'Rifle Country' started by Roadwild17, Apr 13, 2009.

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  1. Roadwild17

    Roadwild17 Member

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    Im interested in making / buying a DMR or SPR rifle in 5.56. I have several reasons why this rifle would be better than a 308 bolt gun for my specific application.

    This is what I'm trying to end up with. http://en.wikipedia.org/wiki/United_States_Navy_Mark_12_Mod_X_Special_Purpose_Rifle



    Anyway, who has something like this available as a over the counter package (just the gun). I know DMPS Mk 12 and Mini SASS, but what else is out there that isn't a varmint rifle?

    If I have to make the rifle that's ok, but what / who makes an accurate, reliable upper?

    Also, isnt 18" a little short for this type of rifle, would 20" give better performance / a little longer range?

    I notices both DMPS rifles have a 1X8 twist, is that for the 62-75gr crowd?
     
  2. Zak Smith

    Zak Smith Moderator Emeritus

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    There are a wide variety of accurate AR-15's in a variety of formats. You'll probably be better off building or buying one for your particular intended uses than the SPR, which is a very specific setup.

    The SPR probably ended up 18" because it was intended for longer range shots, but it needed to use that OPS INC suppressor, which both would influence the overall length of the rifle, and that OPS model needed a collar in a specific position on the barrel.

    -z
     
  3. Pack

    Pack Member

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    When I was looking around for the AR I did buy (basically this: http://www.gunbroker.com/Auction/ViewItem.asp?Item=126683850), I also saw that Armalite had two set up in a similar manner as well:

    http://www.armalite.com/ItemForm.as...Category=8e8e5de6-5022-483e-812b-822e58014822

    http://www.armalite.com/ItemForm.as...Category=8e8e5de6-5022-483e-812b-822e58014822

    Perhaps any of these 3 would be decent starting points?

    I've never owned an Armalite, and so don't know one way or another about their quality. The Bushy that I got, however, seems pretty darn good.
     
  4. Roadwild17

    Roadwild17 Member

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    Well, what would the role be?
     
  5. waterhouse

    waterhouse Member

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    ADCO will build you the upper, in either MOD 0 or MOD 1. Here is my Mod 0:

    [​IMG]

    Bought it on a whim, and it shot fantastic, but I'd listen to Zak. People build them with OPS collars, because that is how the gov't builds them, but I don't own an OPS can.

    I've since sold it. I've also gone through a 18" Noveske in a Mod 1 lookalike, and since settled on an 16" Noveske in a JP tube. It's lighter and does everything I want it to do.
     
  6. Zak Smith

    Zak Smith Moderator Emeritus

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    Yeah, that's why I said unless you want a Mk12 clone just to have one - and nothing wrong with that kind of collecting - you can probably get something better for your use.

    Here's a real SPR
    [​IMG]
    ............... Larger version of above photo.

    Problems: weighs a ton, uses now-obsolete full-length ARMS rail and mounts, has special parts for a silencer most people won't buy.

    There are a lot of high-end uppers on the market now that are intended to fulfill the "compact but very accurate" role. That's more or less what my 17" 3-Gun uppers do, except they have more DMR style optics than SPR optics-- optimized for 3Gun.
     
  7. Roadwild17

    Roadwild17 Member

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  8. Zak Smith

    Zak Smith Moderator Emeritus

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  9. Auburn1992

    Auburn1992 Member

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    waterhouse, where do you find a full length top rail like that?
     
  10. bkb0000

    bkb0000 Member

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  11. LoneRider

    LoneRider Member

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    Any clue when they might start taking orders?
     
  12. waterhouse

    waterhouse Member

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    It was an A.R.M.S. Swan rail on a PRI tube.
     
  13. Roadwild17

    Roadwild17 Member

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    Dosent a setup like that add a little height to the optics?
    Does med / low hight rings compensate for this?
     
  14. LoneRider

    LoneRider Member

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    Just outta curiousity, what provision is there for back-up iron sights in case the scope goes south of the border?

    I'm curious as an SPR Mk.12 is one of two rifles I'm dithering between building in the future (after my current deployment).
     
  15. Zak Smith

    Zak Smith Moderator Emeritus

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    You can see the BUIS on the SPR pictured I posted. It's the same setup on waterhouse's pic.
     
  16. Javelin

    Javelin Member

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    Listen to Bkb0000. Noveske is the best way to go if your building a Special Purpose Rifle.

    The quality and accuracy will be second to none.

    :)
     
  17. Roadwild17

    Roadwild17 Member

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    What about optics? Does the SPR have a low mag optic like 1X4?
     
  18. LoneRider

    LoneRider Member

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    Thanks. They're just like the BUIS on the USMC SAM-R rifle (an old high school pal is a USMC armorer, he's worked with the SAM-R before).

    I've heard Centurion Arms is pretty decent for SPR too.
     
  19. Zak Smith

    Zak Smith Moderator Emeritus

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    Here is a breakdown of different optic types for the carbine


    [​IMG]
    article | Fighting Carbine Optics [​IMG]


    Short answer: the Mk12 SPR has a Leupold 3-9 M/RT, a scope basically designed for the SPR. The concept of the Type III / SPR scope is to go as far as 5.56 is capable of.
     
  20. SudSlinger

    SudSlinger Member

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    great article zak
     
  21. Shung

    Shung Member

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    love mine (clone made out a Match Hbar)

    [​IMG]
     
  22. Jeremy2171

    Jeremy2171 Member

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    FYI SAM-R and Mk12 SPR not the same. SAM-Rs are officially obsolete in the USMC..replaced by the Mk-12.
     
  23. LoneRider

    LoneRider Member

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    I thought the USMC chose to adopt the M39 as their DMR to complement the existing SAM-R in the arsenal.
     
  24. HorseSoldier

    HorseSoldier Member

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    There are separate requirements for precision 5.56mm and precision 7.62mm weapons these days. Not sure on the specifics of that USMC's take on that, but the two aren't mutually exclusive.
     
  25. LoneRider

    LoneRider Member

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    Shung, what sort of a bipod did you use?

    I presume range is one of said requirements due to the longer reach of the 7.62 over the 5.56. The reason I ask is I'm planning to build my own DMR, either based on the Mk.12 or the M110 (I figured an Armalite platform might be best since I've got familiarity with said rifle).
     
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