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Posted: 12/20/2010 8:59:25 AM EDT
[Last Edit: 3/26/2017 2:10:19 PM EDT by RTUtah]
Originally Posted By PSYWAR1-0:

The Recce platform was something that sprung up within the NSW and 5th SFG communities that first became the Special Purpose Receiver built by Crane, which was supposed to be installed on any M4 lower. After a time when the perfect storm of the users wanting a match-grade trigger and the bolt-bounce issue was identified, the Special Purpose Receiver morphed into a complete rifle that was type-classified as the Mk12.

Mk12: A BRIEF HISTORY (as authored by "LGT" & "FL")

Mk12 Special Purpose Rifle (SPR)

Scoped versions of the M16 rifle existed as far back as the 1960s. Like nearly all historic military rifles, the M16 went through decades of efforts to improve its accuracy, both in the military and civilian marksmanship communities.

The need for the SPR dates back to the late 1980s and early 1990s when the 7.62mm M21 sniper rifle, a semi-automatic weapon of Vietnam vintage, was replaced by the M24 sniper rifle, a bolt action weapon. The M24 was originally specified to be a .300 Winchester Magnum, but the Army decided to field it in 7.62 NATO for a variety of economic reasons. This left the M24 in the unenviable position of being the worst of both worlds in the eyes of snipers at the time, since it lost the fast-shooing, semiautomatic capability of the M21, but did not gain the range advantage of the .300WM. This compromise left a vacant requirement for a fast-shooting semi-automatic sniper rifle. This need was most apparent in the US Army Special Forces (SF) community, since the other commands within the Special Operations Forces structure filled that need with Knights Armament Corporation's SR-25 sniper rifle.

Army SF, being prohibited by its leadership from procuring the SR-25, sought the next best alternative, namely a Special Purpose Receiver (SPR) kit to convert the Army SF M4 carbines into highly accurate rifles. In late 1998, at the request of SFC Steve Holland of 5th Special Forces Group, and the approval of the SOPMOD joint IPT, the Special Operations Peculiar Modifications (SOPMOD) Program Manager, Troy Smith, authorized the purchase of 5 sets of commercial items as an SPR experiment.

The original requirement was for USASOC, mainly the SF Groups, as WARCOM had the MK11, 7.62mm system. Once the SPR requirement was developed and demonstrated through experimentation, most of the other commands in USSOCOM added themselves to the Basis of Issue Plan (BOIP). The USSOCOM requirement for the SPR, with improved ammunition, was approved in July 1999, as part of the SOPMOD Kit, Operational Requirements Document, Version 5 (ORD 5).

Further initial development included several variants of the SPR and new ammunition that were compatible with the M4 carbine's lower receiver. It was found that standard issue M855 5.56mm ammunition was not consistent enough to meet the requirement. In 2000, based on an upgrade requirement to provide a match-grade trigger to the design, Mr. Paul Miller, the SPR project manager, discovered an opportunity to pick through over 15,000 M16A1s that had been sent to Crane for destruction. Realizing that these M16A1 rifles, some of which were virtually new, could be used as "free lumber” to build full SPR weapons, Paul selected several thousand rifles to be set aside for the new SPR project. The SPR underwent a minor but significant name change, with the R having originally stood for "Receiver” now standing for "Rifle"

The new weapon system was worthless without a matching round of ammunition to obtain the performance required. The PEO-SP USSOCOM authorized the new round that became Mk262 as part of the Mk12 system in August 2000. Paul Miller and his SPR team refined the 77-grain prototype ammunition and built approximately 124 SPR Rifles in the summer of 2001. These were finished just in time to ship out to Army SF in late October 2001, to be used in the first invasion of Afghanistan. The SPR rifles were extremely well-received, and the SOF combat units ordered hundreds more.

In May 2002, USSOCOM removed the Mk12 and other complete weapons projects from the SOPMOD Program and placed them under the newly-formed USSOCOM Weapons Program. The fielded weapons included two versions (Mk12 Special Purpose Rifle Mod0 and Mod1). Fielding has since been structured for Mk12 Mod1 Special Purpose Rifle only. This rifle is used by Joint USSOCOM Commands and the USMC in combination with M262 (AA53, 77 grain) ammunition. Formal fielding of the full-rate production version of the Mk12 rifle and ammunition occurred in May 2003 and was completed in FY '04.

In 2012, as the decade of war on terrorism was winding down and the SCAR weapon system began replacing the requirement for the Mk12, USSOCOM and Naval Special Warfare divested themselves of the Mk12 weapons system, and the Mk12 is now being looked at to fill a Designated Marksman Role within Brown Water Navy commands.
View Quote
* * * * * * * * * *

The following parts lists and substitution parts was compiled by lancecriminal86 over the course of a LOT of research. Read up and pay attention!

Below are the 100% .mil-spec parts lists to build a true SPR or Mk12 clone. Some of these parts are no longer manufactured and will require much effort and money to locate through forums and online brokers. Keep in mind the rifles were built off donor M16A1s, hence the prevalent A1 parts in the lower receivers and the BCGs. They were also first configured using parts available from 1998-2004, and most are inferior in some ways to newer designs. If this bothers you too much, STOP NOW.

The rifles were issued as a kit in a Pelican 1700 case with cutouts. The kits included the rifle with suppressor, optic, bipod, an Eagle TAS-1 UMSS sling (unobtanium and also absolute crap), with a Dewey 1-piece cleaning rod plus Otis cleaning kit, and a cutout for magazines. An operator’s manual was also included, however these have not been officially released for public consumption. However, the manuals are out there, and some companies building Mk12 uppers include one. Whether these are official .mil operator's manuals or specially made is currently unclear as the manual itself still contains language that it is not for distribution.

- Alternate .mil-spec parts due to NFA, NLA parts, or changes in name/markings for current production in [brackets]

- Extra notes about parts or availability are in (parenthesis)

LOWER
Lower receivers were standard across the SPR/Mk12 variants and the only variations would be between grips, stocks, and buffers. Most were marked either Colt or GM Hydramatic. All other parts were the same in regards to the lower parts. One caveat is the trigger, as the program originally selected the Knight’s Armament 2-stage Full Auto Match trigger. Later on, some issues regarding negligent discharges occurred, and Geissele SSF triggers ultimately found their way into the Mk12 family. Whether 100% of all Mk12s eventually received the Geissele trigger isn’t clear, so either is acceptable.
  • Lower: M16A1 pattern [Nodak Spud NDSA1 or 80% re-profiled/finished/engraved]
  • Trigger: Knight’s 2-Stage Full Auto Match Trigger or Geissele SSF [KAC semi-auto Match or Geissele SSA/SSA-E]
  • Grip: A1, A2, ERGO Original
  • Stock: Originally issued with A1 stocks, both solid D and trapdoor E types; as A1 stocks dwindled, A2 were used; ModH rifles rebuilt with Ace SOCOM stocks
  • Small parts: Standard M16A1 parts

UPPER
The upper receivers, which ultimately differentiate the four variants of the Mk12, have the most variation between each other.


Early SPR/Mod0
  • Upper: Colt, Diemaco, or Armalite marked, flat top, M4 feed-ramps
  • Barrel: Douglas 416r SS, 18” SPR contour, 1/7 twist, flats milled for PRi FSB (Compass Lake, Centurion Arms, High Caliber Sales, and PRi can all supply barrels that meet the appropriate spec minus FSB flats)
  • BCG: Colt M-16
  • Handguard: Precision Reflex Gen I carbon fiber free-float Handguard, rifle length (identified by button-head screws and one vent hole near barrel nut on lower half; no heat shields)
  • A.R.M.S. #38 SPR MOD Sleeve (either the PEQ version or with uneven spacing on the front ¼ but not the full 1913 railed version)
  • FSB: PRi early folding front sight base and gas manifold, set-screw, with elevation wheel
  • Charging handle: PRi Gas Buster M-84 with military latch
  • Muzzle device: OPS Inc 12th Model brake/collar, and 12th Model suppressor [Allen Engineering AEM5 and brake/collar]
  • Rear iron sight: A.R.M.S. #40
  • Scope rings: A.R.M.S. #22 Medium rings, #22 Tactical Ring Cap and #22 Tactical Ring Rail (rings should not include "lever-stop” hump as produced later by A.R.M.S.)
  • Optic: Leupold Vari-X III 3.5-10x40mm LR, M3 turrets, illuminated Mil-Dot reticle (use .308 turret) [Leupold LR/T 3.5-10x40 LR, M3 turrets, Illuminated Mil-Dot reticle]
  • Bipod: Versa-Pod with A.R.M.S. #42, or a Harris with A.R.M.S. #32 (Versa-Pod far inferior to Harris)

Late Mod0
  • Upper: Colt or Diemaco marked, flat top, M4 feed-ramps
  • Barrel: Douglas 416r SS, 18” SPR contour, 1/7 twist, flats milled for PRi FSB (Compass Lake, Centurion Arms, High Caliber Sales, and PRi can all supply barrels that meet the appropriate spec minus FSB flats)
  • BCG: Colt M-16.
  • Handguard: Precision Reflex Gen III carbon fiber free-float handguard, rifle length
  • A.R.M.S. #38 SPR-PEQ-2-3 Sleeve
  • FSB: PRi folding FSB, set-screw, .750 (original production had PRi’s full address engraved on sight tower; those engraved with "PRi USA” are later manufacture)
  • Charging handle: PRi Gas Buster M-84 with military latch
  • Muzzle device: OPS Inc. 12th Model brake/collar, and 12th Model suppressor [Allen Engineering AEM5 and brake/collar]
  • Rear iron sight: A.R.M.S. #40
  • Scope Rings: A.R.M.S. #22 Medium rings (rings should not include "lever-stop” hump as produced later by A.R.M.S.)
  • Optic: Leupold 3-9x36mm TS-30, Mk4 MR/T 2.5-8x36mm TS-30A2, M2 turrets with Mk262 BDC, illuminated TMR reticle
  • Bipod: Harris with either A.R.M.S. #32 or KAC RAS bipod adapter

SPR/A, SPR/B, Mod1
  • Upper: Colt or Diemaco marked, flat top, M4 feed-ramps
  • Barrel: Douglas 416r SS, 18” SPR contour, 1/7 twist, flats milled for PRi FSB (Compass Lake, Centurion Arms, High Caliber Sales, and PRi can all supply barrels that meet the appropriate spec minus FSB flats)
  • BCG: Colt M-16
  • Handguard: Knight’s Armament M4 Match FF RAS, rifle length (now called the SR15/16 Match FF RAS)
  • Gas block: NSWC Crane pattern (Badger Ordnance parkerized/NSN version is correct, has open front of gas tube hole)
  • Charging handle: PRi Gas Buster M-84 with military latch
  • Muzzle device: OPS Inc. 12th Model brake/collar, and 12th Model suppressor [Allen Engineering AEM5 and brake/collar]
  • Scope rings: A.R.M.S. #22 High rings (A.R.M.S. rings should not include "lever-stop” hump as produced later by A.R.M.S.)
  • Optic: Leupold Mk4 MR/T 2.5-8x36mm TS-30A2, M2 turrets with Mk262 BDC, illuminated TMR reticle or NightForce 2.5-10x24 (optionally with NightForce rings)
  • Bipod: Harris with KAC RAS bipod adapter (BRM-S, A.R.M.S. #32 could still optionally be used)

ModH, Mod "Holland"

  • Upper: Colt or Diemaco marked, flat top, M4 feed-ramps
  • Barrel: Noveske 16” Recon, mid-length gas system, profiled for OPS Inc. 12th Model brake/collar (will require aftermarket contouring of most barrels)
  • BCG: Colt M-16
  • Handguard: Precision Reflex Gen III carbon fiber free-float handguard, FDE, rifle length
  • Charging handle: PRi Gas Buster M-84 with military latch
  • Muzzle Device: OPS. Inc. 12th Model brake/collar, and 12th Model suppressor [Allen Engineering AEM5 and brake/collar]
  • Scope Rings: A.R.M.S. #22 Medium rings on PRi recce rail (rings should not include "lever-stop” hump as produced later by A.R.M.S.) or LaRue LT-104 SPR mount
  • Optic: Leupold 3-9x36mm TS-30, Mk4 MR/T 2.5-8x36mm TS-30A2, M2 turrets with Mk262 BDC, illuminated TMR reticle, Leupold Vari-X III 3.5-10x40mm LR, M3 turrets, illuminated Mil-Dot reticle (use .308 turret) [Leupold LR/T 3.5-10x40mm LR, M3 turrets, illuminated Mil-Dot reticle]; S&B Short-Dot
  • Bipod: Harris with either A.R.M.S. #32 or KAC RAS bipod adapter
  • Iron sights: (apparently PRI were supplied but never used)

In the Wild
Naturally, once these rifles were issued to units, operators and even Marines used various non-issued parts. Here is a short summary of what has been seen:

Early SPR/Mod0:
Both Leupold 3.5-10x40mm and 3-9x36mm scopes have been used. Many have had carbine stocks like the old CAR-style, enhanced M4, SOPMOD Gen I, or even the Tactical DuoStock swapped on.

Mod1:
One 3rd SFG-issued rifle pictured with SSgt Robert J. Miller (MoH recipient) used an A.R.M.S #36 S-EX 5.56mm rail, and a Leupold M3X 10x fixed-power scope, possibly pulled from an M-24 or SR-25 rifle. Another has been seen with a Magpul PRS, LaRue mount, and a Premier Reticles 3-15x used by an AMU shooter, and a similar rifle was pictured on a FOB in a very posed-looking photo. Further, a USMC-issued Mod1 was seen using #22 Medium rings instead of High rings, and a LaRue mount has been spotted as well. Grips have varied from the usual A1, A2, and ERGO, and at least one Magpul MIAD has been used. As with the Mod0s, carbine stocks like the SOPMOD and M4 have been used on Mod1s.

ModH:
The Mod "Holland" was already a small-batch configuration, but even as soon as they were issued to 5th SFG units, some Ace SOCOM stocks were replaced with Magpul ACS and CTR stocks. Optics are basically anything existing in the unit's inventory, from S&B ShortDots still in the system, the 3-9x and 3.5-10x Leupold scopes from earlier Mod0s, and there’s even a photo of an ELCAN on a Mod1 floating around. No non-magnified optics like EOTechs or regular Aimpoint M2/M4s, but Micros have been seen on offset mounts. Backup iron sights, as a whole, were almost entirely left unmounted. Grips were again the same usual selection.


Parts Alternatives for Clone Building
Many parts are rare, expensive, and/or both. Despite this, there are some alternatives to a 100% pure clone that will still provide the same visual look and performance. While not a museum-grade clone, most would be hard-pressed to discern the difference. Just know there are those of us out there that will haze and peer-pressure you into further moving your build towards a true clone.

Barrel:
Popular options are the White Oak Armament SPR barrel (rifle gas), BCM’s SPR barrel, Rainier’s Match and Ultramatch offerings (ensure it’s the SPR contour with 12th Model profile), Ballistic Advantage’s SPR barrel. Compass Lake Engineering can also spin a Mk12 profiled barrel with a Criterion chrome-lined blank, or even a Krieger, which was one of the original contenders for the program. The DPMS Mk12 barrels are NOT properly profiled for a clone.

Optics & Rings:
In the case of the Leupold 3-9x or 3.5-10x, it’s generally okay to go for a non-illuminated version of either, sometimes with M1 or other turrets and reticles. As far as the NightForce scope, the 2.5-10x24mm is not generally released to the public anymore (with one recent exception through Sniper’s Hide), so many use the 32mm or even 42mm versions with the #22 High rings. As for the rings, any of the recent produced A.R.M.S. #22s with the lever-stop humps are functionally the same, the desire for non-lever-stops is purely aesthetic when going for the most authentic look. As LaRue LT-104s have been seen in use, it is justifiable to use one depending on whether you have a specific rifle you want to copy, or even just if you absolutely cannot acquire #22 High rings.

A.R.M.S. #38 SWAN Sleeve:
The #38 family of sleeves are no longer available. Finding them secondhand usually cost $250-$300 easy, more for rarer early variants. Fortunately, PRi’s copies of the sleeves look and function almost identically, with minor visual differences. PRi and other builders supply these currently for complete Mod0 builds.

FSB:
While the set-screw version of PRi’s FSB is spec, most use the cross-bolt, clamp-style version. They are extremely robust, and when aligned and torqued, have been shown to hold strong enough that you’ll probably shear your barrel extension pin or upper before it budges. This is mainly how Mod0 uppers are supplied by most vendors, including PRi themselves.

Suppressor, Brake/Collar:
Diverging from the OPS Inc. or AEM brake and collar will get you MAJOR flak. Trust me, I’ve been running an AAC SPR/M4 for years now and it took a LONG time to not get clubbed every time I posted it. The Allen Engineering AEM5 is basically the current production of the OPS Inc. 12th Model, as they were originally made by Ron Allen and his team in the first place. Only minor differences separate original OPS Inc. cans from AE cans, and these are only obvious to trained eyes.

As far as the rest, you can swap Colt parts out for any other .mil-spec parts, like BCM, DD, CMT, etc. Any billet uppers/lowers, funky BCG coatings, extended bolt releases, etc. are extremely frowned upon. Remember, once you start going down the path of building a "better” rifle rather than what was spec, you’re quickly beyond clone territory and would have been better off building a custom 16” or 20” rifle. Cloning is generally viewed as all-in or not at all.


* * * * * * * * * *

Complete Mk12 Mod0 / Mod1 Uppers
Bravo Company Manufacturing
High Caliber Sales
Precision Reflex Inc.


Specific Mk12 Tech
Augee's side-by-side comparison of the original ARMS SWAN Sleeve and PRI reproduction PEQ Sleeves: bottom of p136.
KOBK's side-by-side comparison of PRI Gen I, II, and III handguards, and Gen I and Gen II FSBs, and SWANs: middle of p137.
Augee's Mod1 gas block tech: top half of p357.
Glass1's Early Mod0 photo breakdown: middle of p449.
tamboi's Leupold Vari-X, TS30, and TS30A2 scope history/lineage, and part numbers, p.792


Now that we have a little direction here, let's pick up where we left off on all things Mk12. The following photos are of government-issued Mk12s, NOT user-submitted clones.

Early SPR/Mod0:










Mod1:














ModH:









***CLICK HERE*** Mk12 Photo Archive ***CLICK HERE***
Link Posted: 12/20/2010 9:39:05 AM EDT
In on 1, my contribution. As close as I can get it right now.
Link Posted: 12/20/2010 9:41:47 AM EDT
Glad to see the interest in these rifles is still going strong. I have a rifle that I am converting into one of these, as soon as I finish I will get some pictures up.
Link Posted: 12/20/2010 10:13:03 AM EDT
My original post has been updated with Mod0 and Mod1 build specs but if anything is off, please post up and I'll edit accordingly. Long live the Mk12!
Link Posted: 12/20/2010 8:10:06 PM EDT


Link Posted: 12/20/2010 8:32:42 PM EDT

Link Posted: 12/20/2010 8:43:14 PM EDT
Originally Posted By RTUtah:
Unfortunately, Muskyjerk's original Mk12 thread settled in the archives, but I feel we still need an active thread in which to continue to share photos and discuss all things Mk12-related.

Muskyjerk's original Mk12 Mod0 and Mod1 Pic / Discussion Thread; a wealth of info and photos dedicated to the Mk12.

http://i146.photobucket.com/albums/r249/RTUtah/Mk12b.jpg

http://i146.photobucket.com/albums/r249/RTUtah/Mk12a.jpg

http://i146.photobucket.com/albums/r249/RTUtah/NEWSPR-598x306.jpg

http://i146.photobucket.com/albums/r249/RTUtah/Mk12223.jpg


Mk12 Mod0 Build Specifications
Barrel: 18-inch match-grade stainless free-float heavy profile with 1:7 ratio, rifle-length gas system
Gas Block: PRI flip-up front sight
Muzzle Device: OPS Inc. 12th Model muzzle brake / collar to be paired with the 12th Model suppressor
Handguard: PRI Gen III free-float
Sights: ARMS #40 rear flip-up, PRI front flip-up
Optics: Operator-specific but Leupold 3–9×36mm TS-30 A2 and Nightforce 2.5-10x24 NXS are common
Buttstock: Operator-specific but A1, A2, and LMT SOPMODs are common
Mounts: ARMS #38 SWAN Sleeve rail mount, ARMS #22 medium scope rings, ARMS #32 bi-pod mount (Harris) or ARMS #42 (Versa-Pod)
Bi-pod: Harris or Versa-Pod

Mk12 Mod1 Build Specifications
Barrel: 18-inch match-grade stainless free-float heavy profile with 1:7 ratio, rifle-length gas system
Gas Block: Badger Ordnance stainless Mk12 low-profile
Muzzle Device: OPS Inc. 12th Model muzzle brake / collar to be paired with the 12th Model suppressor
Handguard: KAC M4 Match free-float Rail Adapter System
Sights: KAC 600m rear flip-up, KAC front flip-up
Optics: Operator-specific but Leupold 3–9×36mm TS-30 A2 and Nightforce 2.5-10x24 NXS are common
Buttstock: Operator-specific but A1, A2, and LMT SOPMODs are common
Mounts: ARMS #22 high scope rings, ARMS #32 bi-pod mount (Harris) or ARMS #42 (Versa-Pod)
Bi-pod: Harris or Versa-Pod

Now that we have a little direction here, let's pick up where we left off on all things Mk12...


Who makes that handguard and where can I get it?
Link Posted: 12/20/2010 10:03:08 PM EDT
tag . I never get tired of looking at these
Link Posted: 12/20/2010 10:18:17 PM EDT
In on one as well. Sorry to see the last one go.

Link Posted: 12/20/2010 11:20:01 PM EDT
[Last Edit: 6/14/2012 4:39:38 PM EDT by RFutch]
.....
Link Posted: 12/21/2010 12:31:13 AM EDT
Link Posted: 12/21/2010 12:43:50 AM EDT
[Last Edit: 12/21/2010 9:08:52 AM EDT by RTUtah]
Link Posted: 12/21/2010 12:52:16 AM EDT
Link Posted: 12/21/2010 12:56:09 AM EDT
[Last Edit: 12/21/2010 12:57:04 AM EDT by RTUtah]


Ahh shit, right you are. Can't believe I didn't pay attention to the muzzle device.
Link Posted: 12/21/2010 3:40:58 AM EDT
Glad to see this continue. Upper, scope, and mount will be coming next month. Unfortunately, I'll be waiting on a lower for a couple more months, but I can shoot it on my current BCM. The suppressor is gonna have to wait several months to a year, sadly.

Unless something changes my mind, I'm going to go with the High Caliber Sales upper, Nightforce scope, and use a Larue mount, which is already on it's way. Just can't bring myself to use ARMS mounts.
Link Posted: 12/21/2010 5:19:33 AM EDT
[Last Edit: 12/21/2010 5:28:27 AM EDT by PSYWAR1-0]
Originally Posted By RTUtah:
My original post has been updated with Mod0 and Mod1 build specs but if anything is off, please post up and I'll edit accordingly. Long live the Mk12!


The gas block on the MOD 1 is not made by Badger. Its made in house

Also the weapon must have a Rifle length receiver extension/action spring/buffer

Carbine stocks are a common user mod, but that mod leads to bolt bounce issues in FA and is specificly prohibited by Crane
Link Posted: 12/21/2010 7:13:37 AM EDT
Originally Posted By Shawnmt6601:
tag . I never get tired of looking at these


I agree
Link Posted: 12/21/2010 9:08:16 AM EDT
Originally Posted By PSYWAR1-0:
Originally Posted By RTUtah:
My original post has been updated with Mod0 and Mod1 build specs but if anything is off, please post up and I'll edit accordingly. Long live the Mk12!


The gas block on the MOD 1 is not made by Badger. Its made in house

Also the weapon must have a Rifle length receiver extension/action spring/buffer

Carbine stocks are a common user mod, but that mod leads to bolt bounce issues in FA and is specificly prohibited by Crane


Updated the gas block discrepancy but I could have sworn I read someplace that Badger had the contract.
Link Posted: 12/21/2010 9:14:41 AM EDT
Is the gas port in the Mk12 0.092" or 0.100"? (either seems big)


Link Posted: 12/21/2010 11:39:19 AM EDT
That's too bad the old thread is pretty much gone. There was a huge amount of good info on it. Hopefully this thread will continue on.
Link Posted: 12/21/2010 4:50:18 PM EDT
[Last Edit: 12/21/2010 4:50:56 PM EDT by vroom]
Can some post the parts list from
page 72 of the old thread.
The op's link dosent go up that far.
Thanks.
Link Posted: 12/21/2010 4:58:57 PM EDT
Originally Posted By PSYWAR1-0:
Originally Posted By RTUtah:
My original post has been updated with Mod0 and Mod1 build specs but if anything is off, please post up and I'll edit accordingly. Long live the Mk12!


The gas block on the MOD 1 is not made by Badger. Its made in house

Also the weapon must have a Rifle length receiver extension/action spring/buffer

Carbine stocks are a common user mod, but that mod leads to bolt bounce issues in FA and is specificly prohibited by Crane


http://www.bravocompanyusa.com/Knights-KAC-Mk12-Mod1-Gas-Block-p/kac%20low%20profile%20gas%20block.htm

Low Profile Gas Block made by Knights Armament Company (KAC).

As used on the Naval Special Warfare Command (NSWC) SPR (Mk12 Mod1).

Inside Diameter: .750"

P/N: 99204

Is this false?

Link Posted: 12/21/2010 6:30:17 PM EDT
Originally Posted By 0612Devil:
Originally Posted By PSYWAR1-0:
Originally Posted By RTUtah:
My original post has been updated with Mod0 and Mod1 build specs but if anything is off, please post up and I'll edit accordingly. Long live the Mk12!


The gas block on the MOD 1 is not made by Badger. Its made in house

Also the weapon must have a Rifle length receiver extension/action spring/buffer

Carbine stocks are a common user mod, but that mod leads to bolt bounce issues in FA and is specificly prohibited by Crane


http://www.bravocompanyusa.com/Knights-KAC-Mk12-Mod1-Gas-Block-p/kac%20low%20profile%20gas%20block.htm

Low Profile Gas Block made by Knights Armament Company (KAC).

As used on the Naval Special Warfare Command (NSWC) SPR (Mk12 Mod1).

Inside Diameter: .750"

P/N: 99204

Is this false?



Also, from Badger Ordnance's website:

This is the Mil Spec gas manifold used on the Mk12 Mod1 and Mk18 Mod1 SOCOM rifles. Machined from 416 Stainless Steel.
Link Posted: 12/21/2010 6:55:19 PM EDT
Originally Posted By RTUtah:
Originally Posted By 0612Devil:
Originally Posted By PSYWAR1-0:
Originally Posted By RTUtah:
My original post has been updated with Mod0 and Mod1 build specs but if anything is off, please post up and I'll edit accordingly. Long live the Mk12!


The gas block on the MOD 1 is not made by Badger. Its made in house

Also the weapon must have a Rifle length receiver extension/action spring/buffer

Carbine stocks are a common user mod, but that mod leads to bolt bounce issues in FA and is specificly prohibited by Crane


http://www.bravocompanyusa.com/Knights-KAC-Mk12-Mod1-Gas-Block-p/kac%20low%20profile%20gas%20block.htm

Low Profile Gas Block made by Knights Armament Company (KAC).

As used on the Naval Special Warfare Command (NSWC) SPR (Mk12 Mod1).

Inside Diameter: .750"

P/N: 99204

Is this false?



Also, from Badger Ordnance's website:

This is the Mil Spec gas manifold used on the Mk12 Mod1 and Mk18 Mod1 SOCOM rifles. Machined from 416 Stainless Steel.


So your saying that I should go tell the guys in the shop here on post who make these all day everyday that someone on Arf told them that they dont make them in house
Link Posted: 12/21/2010 7:00:19 PM EDT
[Last Edit: 12/21/2010 7:01:27 PM EDT by PSYWAR1-0]
Must have a KAC trigger since I seem to be having a doubling issue
Link Posted: 12/21/2010 7:01:00 PM EDT
Originally Posted By PSYWAR1-0:
Originally Posted By RTUtah:
Originally Posted By 0612Devil:
Originally Posted By PSYWAR1-0:
Originally Posted By RTUtah:
My original post has been updated with Mod0 and Mod1 build specs but if anything is off, please post up and I'll edit accordingly. Long live the Mk12!


The gas block on the MOD 1 is not made by Badger. Its made in house

Also the weapon must have a Rifle length receiver extension/action spring/buffer

Carbine stocks are a common user mod, but that mod leads to bolt bounce issues in FA and is specificly prohibited by Crane


http://www.bravocompanyusa.com/Knights-KAC-Mk12-Mod1-Gas-Block-p/kac%20low%20profile%20gas%20block.htm

Low Profile Gas Block made by Knights Armament Company (KAC).

As used on the Naval Special Warfare Command (NSWC) SPR (Mk12 Mod1).

Inside Diameter: .750"

P/N: 99204

Is this false?



Also, from Badger Ordnance's website:

This is the Mil Spec gas manifold used on the Mk12 Mod1 and Mk18 Mod1 SOCOM rifles. Machined from 416 Stainless Steel.


So your saying that I should go tell the guys in the shop here on post who make these all day everyday that someone on Arf told them that they dont make them in house


Nope, just quoting the website is all.
Link Posted: 12/21/2010 7:06:12 PM EDT
Originally Posted By RTUtah:
Originally Posted By PSYWAR1-0:
Originally Posted By RTUtah:
Originally Posted By 0612Devil:
Originally Posted By PSYWAR1-0:
Originally Posted By RTUtah:
My original post has been updated with Mod0 and Mod1 build specs but if anything is off, please post up and I'll edit accordingly. Long live the Mk12!


The gas block on the MOD 1 is not made by Badger. Its made in house

Also the weapon must have a Rifle length receiver extension/action spring/buffer

Carbine stocks are a common user mod, but that mod leads to bolt bounce issues in FA and is specificly prohibited by Crane


http://www.bravocompanyusa.com/Knights-KAC-Mk12-Mod1-Gas-Block-p/kac%20low%20profile%20gas%20block.htm

Low Profile Gas Block made by Knights Armament Company (KAC).

As used on the Naval Special Warfare Command (NSWC) SPR (Mk12 Mod1).

Inside Diameter: .750"

P/N: 99204

Is this false?



Also, from Badger Ordnance's website:

This is the Mil Spec gas manifold used on the Mk12 Mod1 and Mk18 Mod1 SOCOM rifles. Machined from 416 Stainless Steel.


So your saying that I should go tell the guys in the shop here on post who make these all day everyday that someone on Arf told them that they dont make them in house


Nope, just quoting the website is all.


Anyone can make a website and say anything they want, does not make it the truth.

IIRC Badger was the source for a small number of the first run of MOD 0's, but the number of rejects for being out of spec, and machineing and refinishing of the salvagable ones led to the decision to make in house for much less than what they could be purchased on the open market. There is a very easy way to tell a Crane produced gasblock.....



Link Posted: 12/21/2010 7:20:13 PM EDT
Originally Posted By PSYWAR1-0:
Anyone can make a website and say anything they want, does not make it the truth.

IIRC Badger was the source for a small number of the first run of MOD 0's, but the number of rejects for being out of spec, and machineing and refinishing of the salvagable ones led to the decision to make in house for much less than what they could be purchased on the open market. There is a very easy way to tell a Crane produced gasblock.....


Understood. So by in-house, I assume you work at Crane?
Link Posted: 12/21/2010 7:30:55 PM EDT
Originally Posted By RTUtah:
Originally Posted By PSYWAR1-0:
Anyone can make a website and say anything they want, does not make it the truth.

IIRC Badger was the source for a small number of the first run of MOD 0's, but the number of rejects for being out of spec, and machineing and refinishing of the salvagable ones led to the decision to make in house for much less than what they could be purchased on the open market. There is a very easy way to tell a Crane produced gasblock.....


Understood. So by in-house, I assume you work at Crane?


Whats Crane? I dug a ditch with one once

Link Posted: 12/21/2010 8:46:05 PM EDT
[Last Edit: 2/11/2014 8:19:50 PM EDT by RTUtah]
Originally Posted By PSYWAR1-0:
Whats Crane? I dug a ditch with one once

View Quote

Never mind, I believe those are SR-25 Mk11 Mod0 rifles.
Link Posted: 12/21/2010 8:57:24 PM EDT
The .308 rifle would be the M110

Link Posted: 12/21/2010 9:08:02 PM EDT
Originally Posted By crowdlg:
The .308 rifle would be the M110



I think the top photo is a M110, Im having a hard time seeing the LOP adjustment. Most folks will say its a M110 just by the scope, but at the grunt level the scopes that come with these weapons never stay the way they are supposed to. Ive seen Lupy's with 300WM dials on Mk12's, 56MM Objective's on SR-25's with bent front ends, WECSOGing the rail with a dremel ect ect ect

The bottom photo is either a MK11 Mod 0, or a SR-25 depending on what the funding source for the weapon was......




Link Posted: 12/21/2010 9:12:54 PM EDT
That almost looks like the same guy. Top picture is an M110 best I can tell. You can see the KAC ajustable stock on it.
Link Posted: 12/21/2010 9:20:36 PM EDT
Originally Posted By DM1975:
That almost looks like the same guy. Top picture is an M110 best I can tell. You can see the KAC ajustable stock on it.


MK11 Mod2 has Adjustable LOP, its just slightly different than the M110's version.

M110 you can adjust without using special tools, MK11 requires the 1/2 inch plastic "Wrench" to adjust that is part of the KAC cleaning kit.

http://www.knightarmco.com/m110.html

The RH view of the entire weapon shows the M110 LOP adjustment wheel, while the close up underneath shows the MK11MOD2 style



Link Posted: 12/21/2010 9:23:31 PM EDT
[Last Edit: 12/21/2010 9:24:10 PM EDT by DM1975]
Originally Posted By PSYWAR1-0:
Originally Posted By DM1975:
That almost looks like the same guy. Top picture is an M110 best I can tell. You can see the KAC ajustable stock on it.


MK11 Mod2 has Adjustable LOP, its just slightly different than the M110's version.

M110 you can adjust without using special tools, MK11 requires the 1/2 inch plastic "Wrench" to adjust that is part of the KAC cleaning kit.

http://www.knightarmco.com/m110.html

The RH view of the entire weapon shows the M110 LOP adjustment wheel, while the close up underneath shows the MK11MOD2 style





Well cool. I did not know that. I still think it looks like the same guy. his helmet setup is kinda the same. Kinda. But the top one is shooting right handed and the bottom left handed.
Link Posted: 12/21/2010 9:54:53 PM EDT
All business.

Link Posted: 12/21/2010 11:53:13 PM EDT
Link Posted: 12/22/2010 12:06:09 AM EDT
Link Posted: 12/22/2010 1:16:51 AM EDT


That is absolutely gorgeous. And thanks for the parts appendix.
Link Posted: 12/22/2010 1:25:00 AM EDT
Any one have a source for the uppers. I was going to get one from BCM but they never have the brake in stock.
Link Posted: 12/22/2010 1:26:03 AM EDT
Originally Posted By StretchMaK:
Any one have a source for the uppers. I was going to get one from BCM but they never have the brake in stock.


I assume you mean completely built uppers?
Link Posted: 12/22/2010 1:27:54 AM EDT
[Last Edit: 12/22/2010 1:32:04 AM EDT by StretchMaK]

Originally Posted By RTUtah:
Originally Posted By StretchMaK:
Any one have a source for the uppers. I was going to get one from BCM but they never have the brake in stock.


I assume you mean completely built uppers?


yes an already built upper with the PRI type tube and the ARMS type optic mount. I could probably build it my self but have never built an upper, I have built/put together a few lowers before but never an upper.
Link Posted: 12/22/2010 1:41:52 AM EDT
Originally Posted By StretchMaK:

Originally Posted By RTUtah:
Originally Posted By StretchMaK:
Any one have a source for the uppers. I was going to get one from BCM but they never have the brake in stock.


I assume you mean completely built uppers?


yes an already built upper with the PRI type tube and the ARMS type optic mount. I could probably build it my self but have never built an upper, I have built/put together a few lowers before but never an upper.


I'm glad you reminded me because I'd like to keep a running tab of current manufacturers who build Mk12 uppers. The only one I can think offhand at the moment is ADCO. They also carry the ARMS mount you'll need and it appears to be in-stock.
Link Posted: 12/22/2010 2:04:53 AM EDT
[Last Edit: 12/22/2010 2:13:59 AM EDT by StretchMaK]

Originally Posted By RTUtah:
Originally Posted By StretchMaK:

Originally Posted By RTUtah:
Originally Posted By StretchMaK:
Any one have a source for the uppers. I was going to get one from BCM but they never have the brake in stock.


I assume you mean completely built uppers?


yes an already built upper with the PRI type tube and the ARMS type optic mount. I could probably build it my self but have never built an upper, I have built/put together a few lowers before but never an upper.


I'm glad you reminded me because I'd like to keep a running tab of current manufacturers who build Mk12 uppers. The only one I can think offhand at the moment is ADCO. They also carry the ARMS mount you'll need and it appears to be in-stock.


WOW I feel dumb, never even thought of ADCO for an upper. Thanks
Link Posted: 12/22/2010 8:12:05 AM EDT
Link Posted: 12/22/2010 8:51:00 AM EDT
ADCO is +1 in my book. I've also heard a lot of great things about Kevin at High Caliber Sales.
Link Posted: 12/22/2010 8:51:59 AM EDT

Originally Posted By StretchMaK:

Originally Posted By RTUtah:
Originally Posted By StretchMaK:
Any one have a source for the uppers. I was going to get one from BCM but they never have the brake in stock.


I assume you mean completely built uppers?


yes an already built upper with the PRI type tube and the ARMS type optic mount. I could probably build it my self but have never built an upper, I have built/put together a few lowers before but never an upper.

The two that I know of that offer a true to spec/as issued model are:

High Caliber Sales. Ask for Kevin he is great. I purchased my Mk12 Mod 1 and Ops 12th suppressor for them and I am very very very happy.

Centurion Arms. Monty is a SEAL Sniper and also makes the real deal.

Both are very highly regarded and both have ties to the military issued Mk12's.
Link Posted: 12/22/2010 9:07:43 AM EDT






Link Posted: 12/22/2010 9:56:05 AM EDT
Originally Posted By StretchMaK:

Originally Posted By RTUtah:
Originally Posted By StretchMaK:

Originally Posted By RTUtah:
Originally Posted By StretchMaK:
Any one have a source for the uppers. I was going to get one from BCM but they never have the brake in stock.


I assume you mean completely built uppers?


yes an already built upper with the PRI type tube and the ARMS type optic mount. I could probably build it my self but have never built an upper, I have built/put together a few lowers before but never an upper.


I'm glad you reminded me because I'd like to keep a running tab of current manufacturers who build Mk12 uppers. The only one I can think offhand at the moment is ADCO. They also carry the ARMS mount you'll need and it appears to be in-stock.


WOW I feel dumb, never even thought of ADCO for an upper. Thanks


Centurion makes mod 1s also
Link Posted: 12/22/2010 10:26:23 AM EDT
Less words, More pics!

Link Posted: 12/22/2010 11:15:29 AM EDT
[Last Edit: 12/22/2010 11:16:10 AM EDT by DM1975]
Originally Posted By Sabre223:
Less words, More pics!

http://i460.photobucket.com/albums/qq323/Sabre223/SPR/Mk12Mod0.jpg?t=1293031448


Is that an M1950 under the rifle? I want to get one of those for myself.
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