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View Full Version : Differences between Mk12Mod1 uppers



m249saw
01-09-11, 15:18
Im looking to build a Mk12Mod1 clone to compliment my newly finished Mk18Mod0 and I have been looking at the different ones offered by the popular dealers.

http://www.highcalibersales.com/Site/MK12_MOD1.html

http://www.adcofirearms.com/itemdetails_.cfm?inventorynumber=4155

http://www.bravocompanyusa.com/BCM-SPR-Mk-12-Mod-Bravo-1R-KAC-RAS-p/bcm-urg-mk12-1%20ras.htm

http://www.centurionarms.com/index.php?page=shop.product_details&flypage=flypage_images.tpl&product_id=48&category_id=18&option=com_virtuemart&Itemid=134

For the life of me I cant seem to find a difference in parts for the range of prices. And like I said all are very reputable for my to drop $1500 for an upper so that isnt a concern.

Any opinions?

Belmont31R
01-09-11, 15:25
High Caliber and Centurion are using the actual contract barrels.


ADCO uses WOA.


BCM uses their own house barrels cut to MK12 specs for the Opcs Inc brake and collar.




Mine was put together by Gun Gallery in FL with a Centurion Mk12 barrel, Colt M4 upper, Colt BCG, BCM GF'er CH, KAC FF RAS, and the Ops inc brake/collar.

m249saw
01-09-11, 18:27
After doing more reading it will be the High Model Sales upper.

Now to choose a lower, KAC SR15 or an LMT Defender either wearing an A2 stock.

TehLlama
01-09-11, 19:10
Running my Centurion DMR on my wife's SR15 lower was an extremely enjoyable experience. If you can justify that cost, I'd do that - the SOPMOD (or MagPul ACS) stock is worth it.

While their DMR isn't the best Mk12Mod1 clone, I happen to like that setup very much (though I'd swap it for a URX-II version over my 12.0 Lite), and if you're not running the OPS 12th, I'd opt for that.

m249saw
01-09-11, 19:21
I picked up a second job just to fund weapons purchases. I cut a few corners with my Mk18 clone (which I intend to correct) but it shoots great.

The Mk12 project will spare no expense, so I figured with the LMT lower and adding a Geissele trigger Id be close to that of a KAC with its 2 stage and ambi controls. So upper wise it will be complete with the Ops 12th (either from High Model or Steve at ADCO). Shoot im even going to order the pre cut Storm case :sarcastic:

40Arpent
01-10-11, 14:03
High Model Sales upper.


Looks like you were mixing High Caliber Sales with Model1 Sales. I think that's a punishable crime. LOL

thmpr
01-10-11, 14:51
Looks like you were mixing High Caliber Sales with Model1 Sales. I think that's a punishable crime. LOL

Agree...had got me going there for awhile. :no:

m249saw
01-10-11, 17:32
Ouch indeed, my apologies.

Exchanged a few emails with Kevin over there, what a nice guy. Uppers are ready, case about 3 weeks and Ops 12ths on the way in. My tax return is gone before I got it :(


Now where is that credit card to order that KAC lower...............

40Arpent
01-10-11, 18:55
...Kevin over there, what a nice guy.

None better.

BaileyMoto
02-07-11, 11:34
+1 for High Caliber Sales. Kevin is amazing to deal with, their uppers utilize the Douglas Premium SS barrels, and are built by Kevin (formally of Crane).

You pay to get an exact clone of a Mk12, that's no lie...but you won't be sorry with the results. I'm shooting just under 1" at 200 yards (.5MOA or so, maybe slightly better):

http://www.mk12.net/bailey/range/smk200yard.jpg

Cesiumsponge
02-19-11, 14:00
How authentic do you want to go?

I got mine put together by MSTN with all Mk12 parts and build except the barrel. Wes specs a Noveske "Mk12 Mod 2" contour SPR barrel which has 3-groove/land rifling. It is not their commercially offered SPR barrel which is polygonal. At the time, Monty at Centurion was just starting up (still had the old website) and there was an estimated 6-8 month wait and I couldn't wait. I even went with the original set screwing on the gas block.

If I had the extra money for another project, I'd go Centurion for the full authenticity (except maybe opt for a pinned gas block) so I could compare the original Compass Lake barrel with Noveske's offering. Any of the top notch barrels should give top-notch performance today. The Mk12 design isn't a spring chicken and it comes down to how authentic you want to get.

Heck, most people opt for the pinned gas block and that isn't original (they were set screwed). I might take mine and get it pinned as well. Lots of folks have taken the SPR concept and updated the components with modern production parts to tailor their tastes and they're very happy. You're limited on optics if you want to do a true clone build though the newer contract Nightforce issued scopes are very nice. Some people have a deep hatred for ARMS mounts as well, which are used on the original. I went with laRue and Seekins.

I'd be more worried about where to find the hot-loaded Mk262 ammo. I still haven't found any so I've settled on SSA's 77gr OTM loads.

mstennes
02-21-11, 13:13
How authentic do you want to go?

I got mine put together by MSTN with all Mk12 parts and build except the barrel. Wes specs a Noveske "Mk12 Mod 2" contour SPR barrel which has 3-groove/land rifling. It is not their commercially offered SPR barrel which is polygonal. At the time, Monty at Centurion was just starting up (still had the old website) and there was an estimated 6-8 month wait and I couldn't wait. I even went with the original set screwing on the gas block.

If I had the extra money for another project, I'd go Centurion for the full authenticity (except maybe opt for a pinned gas block) so I could compare the original Compass Lake barrel with Noveske's offering. Any of the top notch barrels should give top-notch performance today. The Mk12 design isn't a spring chicken and it comes down to how authentic you want to get.

Heck, most people opt for the pinned gas block and that isn't original (they were set screwed). I might take mine and get it pinned as well. Lots of folks have taken the SPR concept and updated the components with modern production parts to tailor their tastes and they're very happy. You're limited on optics if you want to do a true clone build though the newer contract Nightforce issued scopes are very nice. Some people have a deep hatred for ARMS mounts as well, which are used on the original. I went with laRue and Seekins.

I'd be more worried about where to find the hot-loaded Mk262 ammo. I still haven't found any so I've settled on SSA's 77gr OTM loads.

Gun Broker, ARFCOM's EE, but wait for it, Blackhills is producing M262 for the civilian market now!!!
http://blackhillsammo.wordpress.com/2011/02/07/black-hills-5-56mm-now-available-commercially/

BaileyMoto
02-21-11, 18:42
On a side note, I think HighCaliberSales is actually slightly cheaper than Centurion as well (not by much). I know HCS uses the Douglass Premium SS barrels, I assume Centurion uses the same, even though they list them as "Centurion Arms" barrels.

Cesiumsponge
02-21-11, 22:20
Gun Broker, ARFCOM's EE, but wait for it, Blackhills is producing M262 for the civilian market now!!!
http://blackhillsammo.wordpress.com/2011/02/07/black-hills-5-56mm-now-available-commercially/

I actually found this out shortly after I posted that message by Googling out of curiosity to see if things had changed and sourced 500 rounds in the new civilian packaging. It's trickling in and I'm not sure how long it'll last. Demand will probably outweigh supply once words spreads around. It's nice to see the press release state they sub-MOA with a 10-round groups. No one-hole groups! This 50 grain TSX is also interesting. I must look into it.

Monty at Centurion is using the contract Compass Lake Engineering turned Douglass barrels when I inquired back when he had his old website and was only offering the Mk12 and Recce. I assume it still is. I'm not sure if the HCS barrels are processed through the same hands. The info on their site seems to suggest it.

BaileyMoto
02-21-11, 22:28
I actually found this out shortly after I posted that message by Googling out of curiosity to see if things had changed and sourced 500 rounds in the new civilian packaging. It's trickling in and I'm not sure how long it'll last. Demand will probably outweigh supply once words spreads around. It's nice to see the press release state they sub-MOA with a 10-round groups. No one-hole groups! This 50 grain TSX is also interesting. I must look into it.

Monty at Centurion is using the contract Compass Lake Engineering turned Douglass barrels when I inquired back when he had his old website and was only offering the Mk12 and Recce. I assume it still is. I'm not sure if the HCS barrels are processed through the same hands. The info on their site seems to suggest it.

How is this different from the Blackhills SMK 77gr ammo they have had on the market for some time now?

Cesiumsponge
02-22-11, 00:21
The 77gr SMK red or blue box Black Hills stuff is labeled .223 so it's loaded to SAAMI spec. Mk262 chronos about 100-150fps faster as it's loaded to NATO spec. I'm not sure if anyone has worked up a successful load yet, out of my area of knowledge. My ballisticard for the Mk262/AA53 load says its 2740fps @ 60F out of the SPR.

I am not certain if the .223 stuff is cannelured but the Mk262 is. The SSA version is also cannelured and marked as 2,750fps from a 16" barrel. I am not sure what the velocity would be out of an 18".

BHA's blog mentions "Both loads feature military specification brass, sealed military spec primers, temperature-stable military propellant with flash suppressant and are loaded to U.S. 5.56mm pressure limits. " so the 5.56mm version will survive more environmental extremes.

Birddog1911
03-08-11, 12:15
Kevin at High Caliber will treat you very well. He does a great job with his Mk12.

I'm also running the Geissele SSA-E trigger in mine, and I really am happy with it.

The only way that I am deviating from truly authentic with mine is going with a LaRue LT-104 mount, and the NXS 2.5-10x32. That said, I do believe that is the most recent scope, and I've heard from someone currently over there that some of the Navy guys are swapping out their ARMS rings for the LT-104 mount, so I may be alright!

mstennes
03-08-11, 16:44
I actually found this out shortly after I posted that message by Googling out of curiosity to see if things had changed and sourced 500 rounds in the new civilian packaging. It's trickling in and I'm not sure how long it'll last. Demand will probably outweigh supply once words spreads around. It's nice to see the press release state they sub-MOA with a 10-round groups. No one-hole groups! This 50 grain TSX is also interesting. I must look into it.

Monty at Centurion is using the contract Compass Lake Engineering turned Douglass barrels when I inquired back when he had his old website and was only offering the Mk12 and Recce. I assume it still is. I'm not sure if the HCS barrels are processed through the same hands. The info on their site seems to suggest it.

I think you will be able to find it, allot of people just wont shell out what it goes for when they can buy other ammo much cheaper.

BaileyMoto
03-09-11, 07:15
Kevin at High Caliber will treat you very well. He does a great job with his Mk12.

I'm also running the Geissele SSA-E trigger in mine, and I really am happy with it.

The only way that I am deviating from truly authentic with mine is going with a LaRue LT-104 mount, and the NXS 2.5-10x32. That said, I do believe that is the most recent scope, and I've heard from someone currently over there that some of the Navy guys are swapping out their ARMS rings for the LT-104 mount, so I may be alright!

The ones being outfitted in the field are the 2.5-10x24 model I believe. I have seen only one issued rifle with this scope mounted, but it was state side. As a purist, I agree with you. I deviated with my optics and also decided to go with the LMT sopmod stock over the a2 (tho i understand some have been spotted in the field with this stock.....(just repeating rumors)

dangerdan
03-10-11, 17:27
Marines still have the Leupold MR/T 2.5-8x36 scope

marshallwk
03-21-11, 11:36
alot of army units still use the leupold 3.51040 mm. Which for shooting at 800 and below(usually much much less) is fine.

JPB
03-21-11, 16:28
+1 for High Caliber Sales. Kevin is amazing to deal with, their uppers utilize the Douglas Premium SS barrels, and are built by Kevin (formally of Crane).


Actually, I believe HCS MK12s are built by Alan Brown formerly of NSWC Crane. Not sure if Kevin worked at Crane as well. Good guys to deal with none the less.

This is one old thread....

ALCOAR
03-21-11, 16:54
The ones being outfitted in the field are the 2.5-10x24 model I believe. I have seen only one issued rifle with this scope mounted, but it was state side. As a purist, I agree with you. I deviated with my optics and also decided to go with the LMT sopmod stock over the a2 (tho i understand some have been spotted in the field with this stock.....(just repeating rumors)

The x24 has obviously been in use for some time and currently some still are being fielded, however from the horse's mouth...NF is sending far more x32's than x24's currently to the military, and as a fun fact they are even requesting quite a few LV ret. models. Don't forget that some even use the NXS 3.5 w. F1. If were talking the Navy side of the contract, than your liable to see no two operators using the same exact spec'd NF.

Impact
04-29-11, 18:51
I have an upper on order from High Caliber Sales. Kevin is great to work with. I'll probably go with NF 2.5-10-32mm mil/mil and NF rings.

ActiveShooter
05-08-11, 22:57
My upper is a Centurian and I have nothing but great things to say about it.