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Thread: Thinking about building a SPR/MK12 rifle.

  1. #21
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    Quote Originally Posted by Boba Fett v2 View Post
    I've considered building a Mark 12 SPR clone myself, but ultimately decided to put the plans on hold indefinitely. If I were to buy just the upper I'd consider going through High Caliber Sales or BCM. Sourcing an actual NF 2.5-10x24 might prove challenging though.
    This is the one I have been eying for a while http://www.bravocompanyusa.com/BCM-S...-2x%20lt13.htm. With a KAC QD Muzzle Compensator Kit

  2. #22
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    Quote Originally Posted by Djstorm100 View Post
    This is the one I have been eying for a while http://www.bravocompanyusa.com/BCM-S...-2x%20lt13.htm. With a KAC QD Muzzle Compensator Kit
    I'm sure that's a great upper. I've never been let down by any BCM upper. Having said that you can get a Larue Stealth URG (includes a BCG/CH) for cheaper and it has a better upper receiver. But you might have a little wait time.

  3. #23
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    Quote Originally Posted by col.1981 View Post
    I'm sure that's a great upper. I've never been let down by any BCM upper. Having said that you can get a Larue Stealth URG (includes a BCG/CH) for cheaper and it has a better upper receiver. But you might have a little wait time.
    That is true I was looking at them earlier today. The thing is as well the front handguard would be swapped out for a troy for weight saving and I need ambi charging handle (raptor) b/c I'm a lefty.

    how is the upper receiver better?

  4. #24
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    SPR build

    Achieving 2-4" groups at 400-500 yards is a tall order for an AR platform in 5.56mm. I am sure there are going to be many that say they achieve this, and that may be so. However, that is stretching the platform/ammo combination to the EXTREME at that distance. Even Monty LeClaire of Centurion Arms (also bud of Mr. Vickers and top notch SEAL sniper) stated on a Tac-TV episode about the SPR that it isn't a solid 1MOA rifle. I believe he said that is more of a "marketing" thing. While I own and have seen many AR platforms in 5.56 achieve tiny groups (1" and less) at 100 yards, 1" at 100 doesn't always equal 2"/200yds, 3"/300yds, etc. I have read reports (footnote here, READ them/not seen this or experienced myself) the LaRue OBR being capable of great feats of accuracy you desire, but again that is a true stretch. For that range, one might want to consider going to a .308. I have also SEEN great accuracy from 6.5 Grendel and Creedmore rounds. Just my .02, good luck. If you consistently achieve what you are after with an AR in 5.56, let me know the secret!

  5. #25
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    Quote Originally Posted by ericl View Post
    Achieving 2-4" groups at 400-500 yards is a tall order for an AR platform in 5.56mm. I am sure there are going to be many that say they achieve this, and that may be so. However, that is stretching the platform/ammo combination to the EXTREME at that distance. Even Monty LeClaire of Centurion Arms (also bud of Mr. Vickers and top notch SEAL sniper) stated on a Tac-TV episode about the SPR that it isn't a solid 1MOA rifle. I believe he said that is more of a "marketing" thing. While I own and have seen many AR platforms in 5.56 achieve tiny groups (1" and less) at 100 yards, 1" at 100 doesn't always equal 2"/200yds, 3"/300yds, etc. I have read reports (footnote here, READ them/not seen this or experienced myself) the LaRue OBR being capable of great feats of accuracy you desire, but again that is a true stretch. For that range, one might want to consider going to a .308. I have also SEEN great accuracy from 6.5 Grendel and Creedmore rounds. Just my .02, good luck. If you consistently achieve what you are after with an AR in 5.56, let me know the secret!
    2" was being very over optimistic to say the least lol. I've just got a inch to build another AR but don't want another 16incher and can't find anything SBR ugh. lol

  6. #26
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    Quest for accuracy

    I understand the quest for accuracy. I myself am constantly doing the same. I always want to squeeze the maximum accuracy out of even my most basic patrol rifles. While stainless steel barrels are obviously the norm for the SPR builds (no chrome lining which tends to be inconsistent, hence, less accurate), I have been looking at some salt-bath-nitride (aka Melonite / commercial name) options. One can get an awesome CHF 4150 barrel, with the above mentioned treatments. Reports say one gets all the accuracy as well as greater barrel life than that of CL or stainless! Of course, I am going to have to find out for myself (an excuse to build/buy another rifle).

  7. #27
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    Quote Originally Posted by Djstorm100 View Post
    That is true I was looking at them earlier today. The thing is as well the front handguard would be swapped out for a troy for weight saving and I need ambi charging handle (raptor) b/c I'm a lefty.

    how is the upper receiver better?
    Trying to save weight on a SPR? Saving weight in general is fine but is it a SPR or LW build? Consider the trade offs.

    From the Larue Tactical website...
    "The LaRue Stealth receiver is an improved-version of the currently fielded mil-spec flat-top receiver. Machined from billet 7075-T6, the Stealth is designed with more of material in critical areas to alleviate past issues of weakness and to stiffen the receiver, maximizing the weapons overall accuracy."

  8. #28
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    Geissele MK4.

    Rainier Arms Ultramatch Barrel.

    I'd build it around these parts. No point carrying the length and weight of the traditional SPR.

  9. #29
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    Quote Originally Posted by Boba Fett v2 View Post
    I've considered building a Mark 12 SPR clone myself, but ultimately decided to put the plans on hold indefinitely. If I were to buy just the upper I'd consider going through High Caliber Sales or BCM. Sourcing an actual NF 2.5-10x24 might prove challenging though.
    Nope they are out there, just $$$

    I was offered a Army Recon version for $1800, and just couldnt pull the trigger. Love the optic, but thats way over what I consider it's value. Could pick up a Razor HD for that kind of money.

  10. #30
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    Quote Originally Posted by RyanB View Post
    Geissele MK4.

    Rainier Arms Ultramatch Barrel.

    I'd build it around these parts. No point carrying the length and weight of the traditional SPR.
    No, the ultramatch is anything but. Many guys have built on them , and they are nothing special. Many have gone back to Rainer.

    As far as barrles go, nothing will even come close to WOA for value. They simply shoot, and the price cannot be beat. Ive built SPR's withLija's, CLE-Kriegers, Noveske's, and WOA, and to be honest, WOA did not lose a step. I did get a little more fps out of the Noveske, and the intermediate gas system is a little smoother, but not $350 better.


    You need to decide if you want to build a clone, or a SPR type rifle.

    Mod 0 and 1's will be expensive to build. They use ARMS parts, which I refuse to put on any rifle I own. The PRI rail is expesnive, heavy and dated. To be honest, both are very dated designs, and much better products that are lighter are on the market now.

    If I was buiding a SPR type rifle, I would go with a WOA SPR barrel, Fortis 14" rail/ Geiselle/URX , Geiselle DMR/SSA, and a SOPMOD or Bravo stock. Top it off with either the Vortex 2.5-10x32 or the SS 3-15 (best DMR type scopes under $1500). Both are FFP and mil/mil in a NON qd mount like the Badger 1 piece or KAC 1 piece. QD mounts have no place on precision rifles. Throw an atlas bipod with either ADM or Larue QD and quality brake/comp ..............now your talking.

    This will result in a light, very high quality rifle for the money, that will shoot as good as you and the ammo you feed it.
    Last edited by TurretGunner; 08-21-13 at 10:03.

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