MK 12 MOD "DOC"

**docsherm** · 08-11-15, 16:49

I have always liked the Mk12. I like the idea of a precision AR. There were some things that I did not like about it or just wanted to change. This project has taken about two years and I am still not finished. Here is what I came up with.

Upper:
- Rainier Arms Upper (came as a Matched upper & lowers set)
- Noveske 1/7 twist 18" Rifle Length Gas, turned down under the hand guard, with a Switch-Block and black Cerakote
- AAC 51T Break
- Young Mfg National Match Bolt Carrier Group - Full Auto
- Vltor/BCM Charging Handle with Mod 4 (MEDIUM) Latch
- LaRue 12.0 Rail with Index Clips and AFG
- Harris Bipod with LaRue QD Mount
- Troy Front Sight
- KAC 600 M rear Sight
- LaRue SPR Mount
- Leupold VX-R Patrol 3-9x40
- AAC SND-6

Lower:
- Rainier Arms Lower (came as a Matched upper & lowers set)
- Colt LPK
- LMT Ambi Selector
- Timney 3 lbs Single Stage Skeleton Trigger
- Egro Grip
- MagPul Trigger Guard
- Colt A1 Buttstock, Tube, spring, and buffer
- Troy M16A4 Sling Mount
- Moleskin on stock

Lots and lots of Spray Paint.

Now for the long part, the WHY:

The entire rifle is based around the barrel. I wanted a Noveske Barrel, they are the best AR Barrels around for accuracy and longevity. That issue has been beat to death so that is all I will say about it. I did want a rifle length gas system because of how smooth they shoot with rifle buffer system. That posed a problem seeing how John hated that system. So, I had to get with Wes at MSTN to get the barrel that I wanted. As far as I can tell they are the only ones that I know of that have the Rifle Gas system Noveskes. I wanted a Switchblock because I plan on shooting both with and without the can. On all of my other ARs I don't used one but I figured that with this being a purely precision rifle it may help. Wes was great and I got the barrel exact barrel I wanted. I can't say enough good things about MSTN.

Some of the part are just because I had them or I like them. The Upper and Lower were a matched set I got that have no play what so ever. That was what I was looking for in those parts. I have had very good luck with Young Mfg BCGs on precision guns in the past so I stayed with them. I went with the LaRue rail because it is my favorite rail and I do not think that there is a better one out there. I have currently have 6 different LaRue rails and I have never had an issue with any that I have owned. I like single stage triggers on my ARs. For my precision shooting I like Timney the best. It feels the crispest and has the least amount of creep. I used a Colt LPK because I had one on my parts bin and it came with the A1 Stock set. I replace all of the selectors and triggers so no issues there. I have ambi selectors on almost all of my ARs because I shoot both left and right handed, and my wife shoots left handed. I have BUIS on all of my ARs no matter the purpose, that is just the way I am.

I go back and forth with my cans. I mostly use the SND-6 but I have also tried my Mini4 and like that a lot. Not sure which one I am going to dedicate to this rifle.

I have the Leupold VX-R Patrol 3-9x40 on it right now. This scope was never going to be a permanent optic for this rifle. It went one about two years ago. To be honest I really like it on this rifle. The glass is very clear and the fire dot is truly daytime visible. I am going to get a different scope for it with more magnification but I still have not figured what I want to put on it.

Last but not least, the moleskin. I like texture on my face and it helps me get back to the same spot on the stock every time. I also got used it it on my stocks in Afghanistan so my facial hair would't be pulled on my stocks. I hated that.

How it Shoots:

I have 750 rounds through it. Most of the ammo is MK262 or Hornady 75 gr BTHP Match. I have fired some M855 just to see how it would do and to record my DOPE. With the Rifle Gas and the Rifle Buffer it is the smoothest AR I have ever shot. I love the feel. I have had no malfunctions to this date. I have done a 60 round fast fire as a reliability test and still not one issue came up. (I would not call it a pure mag dump as I was still keeping it on target and just trying hit a man size silhouette target at 100 meters. The longest I have had it out to is 300 meters. I need to find a longer range to get it out there. I want to get it out to at least 700 meters when I get some different glass on it.

As for groups I have had my best with MK262. I can't find my photos of my groups so I am not going to even say anything about them. Because I do not want to get into any type of conversation with the internet "trolls".

I do have them logged so PM me if you are interested.

Let me know if you have any questions.

**bsoileau24** · 08-11-15, 17:14

Looks great Doc! This is along the line of my mk 12 type of rifle that I am just starting.

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**O3SKILL** · 08-11-15, 17:15

Nice Rifle Doc. Best thing about the AR is the whole BK have it your way....ergonomics, mission and yes...even aesthetics. Gotta luv it...congrats.

You mentioned that Noveske was not a fan of the Rifle length gas/buffer system. Any idea what his issue(s) were?

**docsherm** · 08-11-15, 17:18

Originally Posted by O3SKILL

Nice Rifle Doc. Best thing about the AR is the whole BK have it your way....ergonomics, mission and yes...even aesthetics. Gotta luv it...congrats.

You mentioned that Noveske was not a fan of the Rifle length gas/buffer system. Any idea what his issue(s) were?

Thanks...and yes it is MY WAY.

John liked the Carbine Buffer on a SPR. He developed his own Intermediate gas system that works better with the Carbine system then the Rifle Buffer.

**Toecheese** · 08-11-15, 17:52

Killer build!!! I bet it's a tack driver for sure.......how much adjustment with the switch block is needed running suppressed?

**docsherm** · 08-11-15, 17:57

Originally Posted by Toecheese

Killer build!!! I bet it's a tack driver for sure.......how much adjustment with the switch block is needed running suppressed?

Thanks and it sure is. Are you referring to the scope adjustments with the Can?

**Toecheese** · 08-12-15, 08:11

Originally Posted by docsherm

Thanks and it sure is. Are you referring to the scope adjustments with the Can?

Correct.....are you able to just run things the same across the board?

**docsherm** · 08-12-15, 10:38

There is some adjustments but not as much with my other rifles that I run cans on. The main reason that I like the AAC Mini4 on it is because the adjustments are very little. That is why I am leaning towards keeping that one on it full time.