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Posted: 12/20/2010 8:59:25 AM EDT
[Last Edit: 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  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


* * * * * * * * * *

As of 16 May 2024, Ron Allen is still making custom parts for his suppressors:
Originally Posted By k31user:

I still make custom stuff.
1-530-742-3248
[email protected]

RonA
View Quote

* * * * * * * * * *


Attachment Attached File

Link Posted: 5/4/2016 3:43:21 PM EDT
[#1]
Anyone's ARMS rings not tight to the rail? I have 2 pairs that seem like they take minimal effort to clamp them to the upper receiver. Feels like they would slide back and forth with recoil. I have another pair of ARMS that are tight as fuck to that rail, and my eotech 553 with ARMS mount, I need a flathead screw driver to unclamp them. Wondering if I could just like put some loctite  or something to help keep it in place. I don't see any way to tighten them
Link Posted: 5/4/2016 3:50:33 PM EDT
[#2]

Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Davey_Sickboy:


Anyone's ARMS rings not tight to the rail? I have 2 pairs that seem like they take minimal effort to clamp them to the upper receiver. Feels like they would slide back and forth with recoil. I have another pair of ARMS that are tight as fuck to that rail, and my eotech 553 with ARMS mount, I need a flathead screw driver to unclamp them. Wondering if I could just like put some loctite  or something to help keep it in place. I don't see any way to tighten them
View Quote




 
I've never been a fan of ARMS mounts as they do not account for any variation in upper receiver tolerances. They do make adjustable levers that allow you to create proper tension. Probably not clone correct but I certainly wouldn't care.




When I briefly had my Elcan I had to use a scewdriver to pry the levers off the upper. Unacceptable on a $2k optic. The problem is that the ARMS mount was integrated with the optic.
Link Posted: 5/4/2016 4:49:00 PM EDT
[#3]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Davey_Sickboy:
Anyone's ARMS rings not tight to the rail? I have 2 pairs that seem like they take minimal effort to clamp them to the upper receiver. Feels like they would slide back and forth with recoil. I have another pair of ARMS that are tight as fuck to that rail, and my eotech 553 with ARMS mount, I need a flathead screw driver to unclamp them. Wondering if I could just like put some loctite  or something to help keep it in place. I don't see any way to tighten them
View Quote


You can add a layer of tinfoil/ thin metal or tape to the inside of the lever tab that rests against the receiver, might be worth a shot if that's not too jerry rigged for your taste. Also the mk II levers are pretty cheap directly from arms.

It's really hit or miss with how tight they'll be on a receiver depending on how worn the rings and/or receiver are. Still with a loose connection on 22's you can slide the front ring as far back with rearward pressure as possible and then clamp it in place, and the rear ring as far forward as possible and clamp it in place, and it'll lock up pretty solid with the scope tightened down.

I do that each time I use these rings but I also test them against receivers to find that tight fit before matching them with a build. My 553 thankfully has stayed fairly tight, there aren't many options available with those besides upgrading the levers or rigging it up.
Link Posted: 5/4/2016 7:06:12 PM EDT
[#4]
What factory loaded 77 gr round do yall recommend?  I recently finished my build but have not made it to the range yet and want to get it dialed in with the good stuff.
Link Posted: 5/4/2016 7:10:08 PM EDT
[#5]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By dogesco93:
What factory loaded 77 gr round do yall recommend?  I recently finished my build but have not made it to the range yet and want to get it dialed in with the good stuff.
View Quote


Most folks seem to like BH 77gr OTM (Mk262) or CBC 77gr (less expensive). We've also seen IMI Razor Core used.

Link Posted: 5/4/2016 7:19:58 PM EDT
[#6]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By minion42:


Most folks seem to like BH 77gr OTM (Mk262) or CBC 77gr (less expensive). We've also seen IMI Razor Core used.

View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By minion42:
Originally Posted By dogesco93:
What factory loaded 77 gr round do yall recommend?  I recently finished my build but have not made it to the range yet and want to get it dialed in with the good stuff.


Most folks seem to like BH 77gr OTM (Mk262) or CBC 77gr (less expensive). We've also seen IMI Razor Core used.



Is the CBC stuff good?  Anyone order from G&R tactical before?  They're the only place I see it in stock for 600 per 1k rounds.
Link Posted: 5/4/2016 7:57:21 PM EDT
[#7]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By dogesco93:


Is the CBC stuff good?  Anyone order from G&R tactical before?  They're the only place I see it in stock for 600 per 1k rounds.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By dogesco93:
Originally Posted By minion42:
Originally Posted By dogesco93:
What factory loaded 77 gr round do yall recommend?  I recently finished my build but have not made it to the range yet and want to get it dialed in with the good stuff.


Most folks seem to like BH 77gr OTM (Mk262) or CBC 77gr (less expensive). We've also seen IMI Razor Core used.



Is the CBC stuff good?  Anyone order from G&R tactical before?  They're the only place I see it in stock for 600 per 1k rounds.


Many people have excellent results with it. The consensus seems to be that you lose a small (if any) bit of performance for a significant price difference compared to Black Hills, making it excellent training and hunting ammo.

As far as that vendor, they're persona non grata here for reasons I'm not totally up on, but I've never personally heard complaints.
Link Posted: 5/4/2016 8:00:16 PM EDT
[#8]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By minion42:


Most folks seem to like BH 77gr OTM (Mk262) or CBC 77gr (less expensive). We've also seen IMI Razor Core used.

View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By minion42:
Originally Posted By dogesco93:
What factory loaded 77 gr round do yall recommend?  I recently finished my build but have not made it to the range yet and want to get it dialed in with the good stuff.


Most folks seem to like BH 77gr OTM (Mk262) or CBC 77gr (less expensive). We've also seen IMI Razor Core used.



With MK262, the spec round that was designed for this gun you get a wealth of free knowledge in the form of published data. Roll back back a few pages and there's an awesome chart a few guys posted. The other weekend I ran some MK262 I had for the first time. Zeroed at 100 and went straight to 300m. First round hit on a 6" plate using published data. Consider the rounds it takes to build a good DOPE book, that's priceless.
Link Posted: 5/4/2016 9:14:28 PM EDT
[Last Edit: secretwheelman] [#9]


Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Davey_Sickboy:



Anyone's ARMS rings not tight to the rail? I have 2 pairs that seem like they take minimal effort to clamp them to the upper receiver. Feels like they would slide back and forth with recoil. I have another pair of ARMS that are tight as fuck to that rail, and my eotech 553 with ARMS mount, I need a flathead screw driver to unclamp them. Wondering if I could just like put some loctite  or something to help keep it in place. I don't see any way to tighten them
View Quote
Clamp the levers down, grab the scope and try to slide it back and forth.



All my #22's are tight, but I have had various #17's that have ranged from extremely tight to barely holding.





 
Link Posted: 5/4/2016 10:13:52 PM EDT
[#10]

Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Davey_Sickboy:





Nothing in this thread requires an A2 stock.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Davey_Sickboy:



Originally Posted By iluvmy86:

can anyone point me to where i can order an A2 Stock Kit? BCM has been out of stock forever...


Nothing in this thread requires an A2 stock.

Theres a rack nimber D stock in the EE. get at it. Good price. Thats what i'd go for.




-700yd range got 2 more trees felled. Trying to make it visible for sat....trying.






Link Posted: 5/4/2016 10:30:05 PM EDT
[#11]

Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Davey_Sickboy:





Nothing in this thread requires an A2 stock.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Davey_Sickboy:



Originally Posted By iluvmy86:

can anyone point me to where i can order an A2 Stock Kit? BCM has been out of stock forever...


Nothing in this thread requires an A2 stock.
This.



http://www.ar15.com/forums/t_7_119/1544528_M16A1__Stock_and_Grip_______37_Shipped.html



http://www.ar15.com/forums/t_7_119/1544228_A_buy_one_get_one_sale_on__M16_but_stocks_and_grips.html



http://www.ar15.com/forums/t_7_119/1538165_Wts___Usgi_A1_stock.html



 
Link Posted: 5/4/2016 10:36:02 PM EDT
[Last Edit: Postal0311] [#12]


Finally built my Mod H.  Just need to get a replacement roll pin for the forward assist.
Link Posted: 5/4/2016 11:06:41 PM EDT
[#13]

Discussion ForumsJump to Quoted PostQuote History




 
That's a pretty receiver set. Factory color/anodizing or coating?
Link Posted: 5/4/2016 11:19:24 PM EDT
[#14]
Me and my rifles in A-Stan:

Mk12 & M4 by Two Sierra, on Flickr
Mk12 by Two Sierra, on Flickr
Link Posted: 5/4/2016 11:21:42 PM EDT
[#15]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Outrider:
  That's a pretty receiver set. Factory color/anodizing or coating?
View Quote


Colt FDE.  Waiting on the rockset to dry before I screw on my 12th model.  With my luck I'd unscrew the muzzle break from the barrel.
Bought a ballistic Advantage barrel.  Will be interesting to see what I can do with it.
Link Posted: 5/4/2016 11:22:20 PM EDT
[#16]

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You billy bad ass you! That smile tho...










-wtf is up with pri making the 05-spr-peq and the 06? All that just for a scalloped vs non scalloped front, and the 06 isnt online....thats weird. I looked and saw the 06 is correct.....
Link Posted: 5/4/2016 11:54:41 PM EDT
[#17]

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Originally Posted By HaveBlue83:





  You billy bad ass you! That smile tho...
-wtf is up with pri making the 05-spr-peq and the 06? All that just for a scalloped vs non scalloped front, and the 06 isnt online....thats weird. I looked and saw the 06 is correct.....

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Originally Posted By HaveBlue83:





  You billy bad ass you! That smile tho...
-wtf is up with pri making the 05-spr-peq and the 06? All that just for a scalloped vs non scalloped front, and the 06 isnt online....thats weird. I looked and saw the 06 is correct.....

If you're buying a sleeve made by PRI, it's wrong anyway. Scalloped or not.



 
Link Posted: 5/5/2016 12:04:51 AM EDT
[#18]
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Originally Posted By secretwheelman:
Clamp the levers down, grab the scope and try to slide it back and forth.

All my #22's are tight, but I have had various #17's that have ranged from extremely tight to barely holding.
 
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Originally Posted By secretwheelman:
Originally Posted By Davey_Sickboy:
Anyone's ARMS rings not tight to the rail? I have 2 pairs that seem like they take minimal effort to clamp them to the upper receiver. Feels like they would slide back and forth with recoil. I have another pair of ARMS that are tight as fuck to that rail, and my eotech 553 with ARMS mount, I need a flathead screw driver to unclamp them. Wondering if I could just like put some loctite  or something to help keep it in place. I don't see any way to tighten them
Clamp the levers down, grab the scope and try to slide it back and forth.

All my #22's are tight, but I have had various #17's that have ranged from extremely tight to barely holding.
 


My 22M's are tight as hell.
Link Posted: 5/5/2016 3:18:46 AM EDT
[#19]
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Originally Posted By TheTacticalCoyote:
Me and my rifles in A-Stan:

<a href="https://flic.kr/p/GPfP8y" target="_blank">https://farm8.staticflickr.com/7615/26789036146_f6f19d3b34_b.jpg</a>Mk12 & M4 by Two Sierra, on Flickr
<a href="https://flic.kr/p/FWMgyo" target="_blank">https://farm8.staticflickr.com/7474/26217837114_f2c795172b_b.jpg</a>Mk12 by Two Sierra, on Flickr
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Was always a fan of this picture. It's been around for quite some time. Nice to see the man behind the rifle. Thank you for your service sir.

And thanks for the ARMS advice. The ones on my 556 mod1 are too loose for comfort, but doesn't shift in the rail slots. I would just say fuck it and replace them....but original #nls yo
Link Posted: 5/5/2016 4:54:50 AM EDT
[#20]
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Picture no worky

And I can drop a roll pin in an envelope if you still need one, shoot me an IM if so
Link Posted: 5/5/2016 4:57:48 AM EDT
[#21]
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Originally Posted By iluvmy86:
can anyone point me to where i can order an A2 Stock Kit? BCM has been out of stock forever...
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A1 bro. But if you still want an A2, White Oak has em.
Link Posted: 5/5/2016 10:06:51 AM EDT
[Last Edit: HaveBlue83] [#22]


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Originally Posted By secretwheelman:





If you're buying a sleeve made by PRI, it's wrong anyway. Scalloped or not.


 
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Originally Posted By secretwheelman:





Originally Posted By HaveBlue83:







  You billy bad ass you! That smile tho...
-wtf is up with pri making the 05-spr-peq and the 06? All that just for a scalloped vs non scalloped front, and the 06 isnt online....thats weird. I looked and saw the 06 is correct.....


If you're buying a sleeve made by PRI, it's wrong anyway. Scalloped or not.


 




HOOAH

 
Link Posted: 5/5/2016 3:10:42 PM EDT
[#23]
" />
Link Posted: 5/5/2016 3:19:11 PM EDT
[Last Edit: GuynamedDave] [#24]
Contemplating painting my Mod 1 but not sure which direction to go. I am a fan of solid colors but they don't seem to get much love in the 12s, everyone tends to favor camo patterns. Is there a reason behind this?

I'm thinking Magpul FDE, if not because I have 2 unused cans of Alumahyde 2
Link Posted: 5/5/2016 3:50:13 PM EDT
[#25]

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Originally Posted By GuynamedDave:


Contemplating painting my Mod 1 but not sure which direction to go. I am a fan of solid colors but they don't seem to get much love in the 12s, everyone tends to favor camo patterns. Is there a reason behind this?



I'm thinking Magpul FDE, if not because I have 2 unused cans of Alumahyde 2
View Quote
I used to paint all mine OD green simply because that was the only good color I could find in self etching primer.  It's tough as nails when prepped and applied correctly.  Camo came about when I got bored.
Link Posted: 5/5/2016 8:50:56 PM EDT
[#26]
Not mine but there is a brand new FF RAS in the EE if anyone needs one.
Link Posted: 5/5/2016 9:04:14 PM EDT
[#27]
Operation parts got another batch too. 26 last time I looked.
Link Posted: 5/5/2016 10:49:31 PM EDT
[#28]
Anyone have a line on any A.R.M.S. 22m rings?  I've got my Vortex 2.5-10 x32 (I know, not clone correct,  but best I could do now) and my mod 0 ready to go, just need the rings.  

Andrew
Link Posted: 5/5/2016 10:52:57 PM EDT
[#29]
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Originally Posted By Jmarko:
Not mine but there is a brand new FF RAS in the EE if anyone needs one.
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Ooohhhhhh.... To swap out my URX 3.1 for a FF RAS on a "Reece" or not? Hmmmmmm
Link Posted: 5/5/2016 10:58:42 PM EDT
[#30]
What's the going rate for an A1 stock? Type D no trap door.
Link Posted: 5/5/2016 11:05:50 PM EDT
[#31]

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Originally Posted By Samson-Dogg:


What's the going rate for an A1 stock? Type D no trap door.
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What condition?



 
Link Posted: 5/5/2016 11:06:25 PM EDT
[#32]
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Originally Posted By secretwheelman:
What condition?
 
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Originally Posted By secretwheelman:
Originally Posted By Samson-Dogg:
What's the going rate for an A1 stock? Type D no trap door.
What condition?
 

Good to excellent
Link Posted: 5/5/2016 11:19:59 PM EDT
[#33]

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Originally Posted By Samson-Dogg:





Good to excellent
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Originally Posted By Samson-Dogg:



Originally Posted By secretwheelman:


Originally Posted By Samson-Dogg:

What's the going rate for an A1 stock? Type D no trap door.
What condition?

 


Good to excellent
For just the stock body; $65-$85.



 
Link Posted: 5/5/2016 11:25:51 PM EDT
[#34]
Who is everyone's go-to supplier for the MK262 "clone" rounds?  Whether it be black hills, the CBC, or IMI.  I'm trying to find some that is in stock to shoot a new build and stock it.
Link Posted: 5/5/2016 11:36:24 PM EDT
[Last Edit: RyanO20] [#35]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By dogesco93:
Who is everyone's go-to supplier for the MK262 "clone" rounds?  Whether it be black hills, the CBC, or IMI.  I'm trying to find some that is in stock to shoot a new build and stock it.
View Quote


Black Hills isn't 'clone' rounds, it's THE round. The red box 5.56 77 OTM is new production MK262 for the civilian market. Just doesn't have a mark designation cause well, it's the civilian market.

That said, check out Old Virginia and Triad Tactical for the real deal.
Link Posted: 5/5/2016 11:51:25 PM EDT
[#36]
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Originally Posted By dogesco93:
Who is everyone's go-to supplier for the MK262 "clone" rounds?  Whether it be black hills, the CBC, or IMI.  I'm trying to find some that is in stock to shoot a new build and stock it.
View Quote


High Caliber Sales also stocks it. The Mk12 system was designed in conjunction with the Mk262 round.
Link Posted: 5/5/2016 11:59:34 PM EDT
[#37]
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Originally Posted By secretwheelman:
For just the stock body; $65-$85.
 
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Originally Posted By secretwheelman:
Originally Posted By Samson-Dogg:
Originally Posted By secretwheelman:
Originally Posted By Samson-Dogg:
What's the going rate for an A1 stock? Type D no trap door.
What condition?
 

Good to excellent
For just the stock body; $65-$85.
 

Hmmm.... There's someone selling 3 A1 stocks for 89.95 in the EE. He has 20 sets of 3.
Link Posted: 5/6/2016 12:04:26 AM EDT
[#38]
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Originally Posted By Engel12626:
Picture no worky

And I can drop a roll pin in an envelope if you still need one, shoot me an IM if so
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How about this:
Got the barrels in for both in the same day.



Got the can on it now.  Now sure what I am going to do about optics.

Thanks for the offer on the pin, but I won't have any issue getting another.  Pretty sure I have some laying around.
Link Posted: 5/6/2016 12:06:42 AM EDT
[Last Edit: secretwheelman] [#39]


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Originally Posted By Samson-Dogg:
Hmmm.... There's someone selling 3 A1 stocks for 89.95 in the EE. He has 20 sets of 3.
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Originally Posted By Samson-Dogg:





Originally Posted By secretwheelman:




Originally Posted By Samson-Dogg:




Originally Posted By secretwheelman:




Originally Posted By Samson-Dogg:


What's the going rate for an A1 stock? Type D no trap door.
What condition?


 



Good to excellent
For just the stock body; $65-$85.


 



Hmmm.... There's someone selling 3 A1 stocks for 89.95 in the EE. He has 20 sets of 3.
Beat to shit or heavily mottled(if you're in to that) are normally $40ish.





I'd jump.



ETA: With 60 of 'em, it's a safe bet that he didn't pay much per unit.





 
Link Posted: 5/6/2016 12:07:39 AM EDT
[#40]
Anybody used Aervoe Coyote on their 12? I'm thinking a paint party this weekend....
Link Posted: 5/6/2016 12:17:05 AM EDT
[#41]
This is the ad for the stocks. I'm thinking about getting 2 sets.
http://www.ar15.com/forums/t_7_159/1545264_.html&r=&page=1
Link Posted: 5/6/2016 1:28:01 AM EDT
[#42]
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Originally Posted By Samson-Dogg:
This is the ad for the stocks. I'm thinking about getting 2 sets.
http://www.ar15.com/forums/t_7_159/1545264_.html&r=&page=1
View Quote


I went ahead and grabbed a set. Selling one to a buddy. One for my mod 0 and save one.
Link Posted: 5/6/2016 4:55:31 AM EDT
[Last Edit: steelrain7557] [#43]
And just bought one of the MK12 rails off operation parts...officially on the MK12 Mod 1 build route. My wallet started crying.
Link Posted: 5/6/2016 7:00:00 AM EDT
[#44]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Samson-Dogg:
This is the ad for the stocks. I'm thinking about getting 2 sets.
http://www.ar15.com/forums/t_7_159/1545264_.html&r=&page=1
View Quote


He probably cherry picked those for the photo, but even if what you get is close to that'd if be happy. Are you going to paint your MK12's?

Picked up a metal mag and fixed the ring spacing on mine



Mine has the trap door, which I like, but also it is an older stock with a genuine cage code painted on the stock which I love. When she gets painted (soon now) I'm gonna stincel the cage code and put it back on there on each side. Just can't decide if I wanna use matte white or flat black paint for that.

Link Posted: 5/6/2016 7:28:47 AM EDT
[#45]
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Originally Posted By Davey_Sickboy:

Nothing in this thread requires an A2 stock.
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Originally Posted By Davey_Sickboy:
Originally Posted By iluvmy86:
can anyone point me to where i can order an A2 Stock Kit? BCM has been out of stock forever...

Nothing in this thread requires an A2 stock.


On page one it says A2's were used as A1's became scarce.
Link Posted: 5/6/2016 8:09:55 AM EDT
[#46]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By RyanO20:


He probably cherry picked those for the photo, but even if what you get is close to that'd if be happy. Are you going to paint your MK12's?

Picked up a metal mag and fixed the ring spacing on mine

<a href="http://s1368.photobucket.com/user/Rhino2014/media/Mobile%20Uploads/image_zpso6bnqic7.jpeg.html" target="_blank">http://i1368.photobucket.com/albums/ag166/Rhino2014/Mobile%20Uploads/image_zpso6bnqic7.jpeg</a>

Mine has the trap door, which I like, but also it is an older stock with a genuine cage code painted on the stock which I love. When she gets painted (soon now) I'm gonna stincel the cage code and put it back on there on each side. Just can't decide if I wanna use matte white or flat black paint for that.

<a href="http://s1368.photobucket.com/user/Rhino2014/media/Mobile%20Uploads/image_zpsmmypt8fd.jpeg.html" target="_blank">http://i1368.photobucket.com/albums/ag166/Rhino2014/Mobile%20Uploads/image_zpsmmypt8fd.jpeg</a>
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Originally Posted By RyanO20:
Originally Posted By Samson-Dogg:
This is the ad for the stocks. I'm thinking about getting 2 sets.
http://www.ar15.com/forums/t_7_159/1545264_.html&r=&page=1


He probably cherry picked those for the photo, but even if what you get is close to that'd if be happy. Are you going to paint your MK12's?

Picked up a metal mag and fixed the ring spacing on mine

<a href="http://s1368.photobucket.com/user/Rhino2014/media/Mobile%20Uploads/image_zpso6bnqic7.jpeg.html" target="_blank">http://i1368.photobucket.com/albums/ag166/Rhino2014/Mobile%20Uploads/image_zpso6bnqic7.jpeg</a>

Mine has the trap door, which I like, but also it is an older stock with a genuine cage code painted on the stock which I love. When she gets painted (soon now) I'm gonna stincel the cage code and put it back on there on each side. Just can't decide if I wanna use matte white or flat black paint for that.

<a href="http://s1368.photobucket.com/user/Rhino2014/media/Mobile%20Uploads/image_zpsmmypt8fd.jpeg.html" target="_blank">http://i1368.photobucket.com/albums/ag166/Rhino2014/Mobile%20Uploads/image_zpsmmypt8fd.jpeg</a>

I'm sure I'll end up painting. I've seen a few paint jobs in this thread that were awesome. I guess sometimes you just hit something just right. Right now I've just got groups of parts every where. I've collected all the hard to find things like long collars,rails,wheeled fsgb,PEQ sleeve, non-winged sights, non-lever stop rings etc. The AEM5's are on form 4. The only part I am having difficulty finding now is a second sleeve. I had intended to only build a late mod 0 until I got the wheeled fsgb. Now I need to do both early and late.
Link Posted: 5/6/2016 8:18:20 AM EDT
[#47]

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Originally Posted By TNW:
On page one it says A2's were used as A1's became scarce.
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Originally Posted By TNW:



Originally Posted By Davey_Sickboy:


Originally Posted By iluvmy86:

can anyone point me to where i can order an A2 Stock Kit? BCM has been out of stock forever...


Nothing in this thread requires an A2 stock.




On page one it says A2's were used as A1's became scarce.
There are a couple pics of a Marine with an A2 on a mod1.



No go on a 0.



 
Link Posted: 5/6/2016 9:05:27 AM EDT
[#48]
Us larger and superior folk use the A2
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By secretwheelman:
There are a couple pics of a Marine with an A2 on a mod1.

No go on a 0.
 
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Originally Posted By secretwheelman:
Originally Posted By TNW:
Originally Posted By Davey_Sickboy:
Originally Posted By iluvmy86:
can anyone point me to where i can order an A2 Stock Kit? BCM has been out of stock forever...

Nothing in this thread requires an A2 stock.


On page one it says A2's were used as A1's became scarce.
There are a couple pics of a Marine with an A2 on a mod1.

No go on a 0.
 

Link Posted: 5/6/2016 11:27:46 AM EDT
[#49]

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Originally Posted By Great_Balls_of_Fire:


Us larger and superior folk use the A2




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Originally Posted By Great_Balls_of_Fire:


Us larger and superior folk use the A2


Originally Posted By secretwheelman:


Originally Posted By TNW:


Originally Posted By Davey_Sickboy:


Originally Posted By iluvmy86:

can anyone point me to where i can order an A2 Stock Kit? BCM has been out of stock forever...


Nothing in this thread requires an A2 stock.




On page one it says A2's were used as A1's became scarce.
There are a couple pics of a Marine with an A2 on a mod1.



No go on a 0.

 


Pssshhh.



A2's belong on SAM-R's.



 
Link Posted: 5/6/2016 1:18:53 PM EDT
[Last Edit: Johnson184] [#50]
Brownells has Mk12 mod 1 rails!!
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