Thank you Form I’m now a mk12 believer

[77TMK]

Reviving this as in the market for a precision ar. Any benefit in a mk12 mod 0 as opposed to a geissele super duty?

The super duties are not necessarily "precision" rifles, and most Mk12 Mod 0 builds I have used are with average barrels. If you want a turnkey AR, the most cost effective yet also significantly most precise setup will be a SOLGW Broadsword upper with their SPR barrel and L89 rail.

If you really like the PRI forend, grab a forend, thermal-fit receiver, and SOLGW SPR 16-18" barrel. I've tried WOA, Douglas, Krieger, Bartlein, and BA "mk12" type barrels, and none of them were in the same league as the SPR barrels SOLGW sources. The 5/8x24 muzzle is a genuine benefit, and the source of the SOLGW SPR barrels (BHW) is unique.


More precise but more expensive will the Ridgeline rifle.

 

[RockAndSage]

More precise but more expensive will the Ridgeline rifle.

Are the Ridgelines really more accurate than PRIs or the Brouwers?

 

[Avonac]

Are the Ridgelines really more accurate than PRIs or the Brouwers?

I’ve never shot a PRI or Brouwer but my Ridgeline is a hammer. My test target was a .4 and I have killed Prairie dogs past 700 yds. It’s the softest shooting precision AR I have shot

 

[bascott1]

Can’t find a ridgeline in stock anywhere

 

[omicron1792]

@Formidilosus and others.

I have this m4. It has factory colt 1:7” barrel at 16”. Free floated hand guard. Upgraded trigger and bcg. Adjustable stock.



What accuracy benefits would I see with a MK 12? Would it just be the longer heavier Douglas barrel?

 

[77TMK]

Can’t find a ridgeline in stock anywhere

They are very small batch rifles. Next best bet is the SOLGW SPR / Broadsword ones. You could alternatively just buy the barrel and handguard, and build it. Do you know how to properly assemble one, or someone nearby who does?

 

[Avonac]

@Formidilosus and others.

I have this m4. It has factory colt 1:7” barrel at 16”. Free floated hand guard. Upgraded trigger and bcg. Adjustable stock.

View attachment 1094636

What accuracy benefits would I see with a MK 12? Would it just be the longer heavier Douglas barrel?

You are most likely going to see better performance with the Douglas barrel. Another benefit is going to be how the receiver and handguard lock up. This is going to be a big benefit to mitigate poi shift from different positions.

 

[justinspicher]

Can’t find a ridgeline in stock anywhere

WTS Thread 'Ridgeline Defense LPR Upper'

Jan 20, 2026

Lightly used. Maybe 70rds through it. Complete upper as sold from Ridgeline. (suppressor, lower, scope, mount, etc not included) I had to slightly file the front and rear takedown pin tabs for it to fit my Larue lower. Still has an extremely tight fit and did not impede function with other lowers I tried it on.

$1500 shipped

• low2497
• Replies: 6
• Forum: Gun & Gun Parts Classifieds

Not a full rifle or new, but……

 

[Steel Rain]

Reviving this as in the market for a precision ar. Any benefit in a mk12 mod 0 as opposed to a geissele super duty?

I have the PRI MK12 Mod0 and two 16” Super Dutys. They are all extremely accurate but different. The SDs are my boys’ rifles. I will add a short barreled SD to the safe in the future. The SD triggers are amazing. That all being said, I’ll never part with my MK12.

 

[bascott1]

They are very small batch rifles. Next best bet is the SOLGW SPR / Broadsword ones. You could alternatively just buy the barrel and handguard, and build it. Do you know how to properly assemble one, or someone nearby who does?

Yeah. Got a good buddy that’s really good with them.

 

[bascott1]

I have the PRI MK12 Mod0 and two 16” Super Dutys. They are all extremely accurate but different. The SDs are my boys’ rifles. I will add a short barreled SD to the safe in the future. The SD triggers are amazing. That all being said, I’ll never part with my MK12.

Like the mk12 that much more? Wanting a do all rifle, shoot deer, matches, varmints and just have fun with. The mk12 seems like it fits that bill

 

[Floridave]

What is the practical difference between a MK12 clone and free floated ar15 with 18 inch barrel with rifle length gas system and fixed stock with rifle length buffer tube?

Well i guess i answered my own question below.
After perusing this thread it made me wonder, as when I built whats now my primary AR, I patterned it to follow those MK 12 attributes but using modern readily available parts. Not having been in the military I didn’t have the attachment to a particular historical correct version.

-—————————————————-//
The practical difference comes down to historical replication versus modern optimization. While both feature an 18-inch barrel and rifle-length gas/buffer systems, a genuine Mk12 is a heavy, mission-specific military clone, whereas a modern AR-15 build provides equal precision with significantly less weight and better modularity.

Practical Outcomes for the Shooter
* Handling and Maneuverability: The military Mk12 was designed to be a designated marksman rifle, heavily weighted so the shooter could maintain a stable platform. A modern equivalent build uses lighter materials and slim M-LOK rails, making it vastly superior for off-hand shooting, transitions, and carrying over long distances.
*
* Barrel Profiles and Heat: The Mk12's heavy barrel retains heat well during extended, rapid strings of fire. Modern ARs use lighter profiles that heat up faster but handle better; to mitigate this, modern builders often choose fluted or carbon-wrapped barrels that maintain stiffness without the extra weight.
*
* Suppressor Integration: The Mk12 platform requires the dedicated OPS Inc./Allen Engineering brake and collar system to mount its legacy suppressors. A modern build uses standard threading, allowing you to choose from hundreds of modern, lightweight suppressors on the market without being locked into a single mounting ecosystem.
*
* Accuracy and Parts Availability: Both setups are mechanically capable of consistent hits past 600 meters using match-grade 75- or 77-grain ammunition (like Mk 262). However, a modern build uses standardized mil-spec parts, making maintenance, repairs, and swapping components significantly easier than sourcing proprietary Mk12 parts.
*

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