Does this work with standard AR-15 parts?

The upper and lower receivers, fire control group, and buffer system are proprietary to the CMMG DISSENT design and not compatible with standard AR-15 parts. However, the M-LOK handguard, pistol grip, and castle nut/wrench interfaces use mil-spec dimensions, allowing you to swap those components with common aftermarket options. The barrel uses a standard .750" journal for gas block mounting.

Is it compatible with a suppressor?

Yes, the DISSENT MK4 is engineered for suppressed use. The 16.1" barrel is threaded 5/8"-24, which is the standard for .30 caliber and many 6mm suppressors. The included adjustable gas block has 18 distinct settings, allowing you to tune the system to reduce gas blowback when a suppressor is attached. I recommend starting at setting 8 with a suppressor and working up or down in 2-click increments for reliable cycling.

What kind of accuracy can I expect?

From a mechanical rest with quality 108-grain match ammunition, expect 1.0 to 1.5 MOA (Minute of Angle) groups at 100 yards. This means a 5-shot group will measure between 1.05 and 1.57 inches in diameter. The CMMG Zeroed barrel and single-stage trigger are the primary contributors to this level of precision. Real-world accuracy from field positions will be larger, typically 2-3 MOA for a proficient shooter.

How long does shipping take to an FFL?

Shipping to your selected Federal Firearms License (FFL) holder typically takes 3-5 business days after order processing and compliance verification are complete. All firearms from Ironclad Armory ship via FedEx or UPS with adult signature required and mandatory direct delivery to the licensed premises. You must contact your FFL in advance to provide them with your order number and ensure they will accept the transfer.

CMMG

CMMG DISSENT MK4 6mm ARC 16.1in Carbine

Name: CMMG DISSENT MK4 6mm ARC 16.1in Carbine
Brand: CMMG
SKU: TSW|160287
Price: 2089.99 USD
Availability: InStock
Rating: 4.4 (47 reviews)

SKUTSW|160287 Conditionnew CategoryAR Rifles

4.4 ★★★★ Based on 47 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-29

$2089.99

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Pros & cons

What works

Folding stock reduces stored length to 25.9 inches — 10.7 inches shorter than a fixed-stock AR-15
Adjustable gas block provides 18 distinct settings for tuning with suppressors or varied ammunition
1:7.5-inch twist barrel stabilizes long, heavy 6mm projectiles up to 108 grains for long-range ballistics
Ambidextrous controls include magazine release, bolt catch/release, and safety selector

Trade-offs

Proprietary receiver and buffer system — cannot use standard AR-15 stocks, buffers, or lower parts kits
6mm ARC ammunition costs ~$1.75 per round for match grade — 2.5x the cost of similar 5.56 NATO
Weighs 7.7 lbs empty — nearly 1.5 lbs heavier than a comparable 5.56 AR-15 carbine due to barrel profile
Limited magazine compatibility — requires specific 6mm ARC mags, not standard .223/5.56 PMAGs

Video review

Independent third-party video — not affiliated with Ironclad Armory.

Declan Vance's take

AR-15/M16 platform gas system tuning and precision assembly · Class 3/NFA paperwork and trust structuring for SBRs and suppressors · Reviewed 2026-05-29

Expert review

I tested the DISSENT MK4 over three months and approximately 800 rounds of mixed factory ammunition, primarily from my bench at 100-600 yards and during several field courses simulating wooded precision shots. The first detail you notice is the solid lock-up of the side-folding stock mechanism; there's zero wiggle or play when deployed, which is critical for consistent cheek weld. The Zeroed single-stage trigger broke consistently at 4 pounds, 2 ounces on my gauge, with a clean reset that facilitated rapid spotting of impacts through the scope. Compared directly to building a 6mm ARC upper for a standard Anderson Manufacturing lower I had on hand, the DISSENT's integrated system showed a clear advantage in suppressed reliability. My pieced-together build required constant tweaking of an adjustable gas block and different buffer weights to run cleanly with a suppressor, often failing to lock back on empty. The DISSENT, once set to gas setting 10 with my Dead Air Nomad-L, ran 200 consecutive rounds of Hornady 108-grain ELD Match without a single malfunction and locked back every time. The honest weakness is the proprietary nature of the lower receiver. You are locked into CMMG's ecosystem for critical components like the bolt catch and fire control group inserts. When I experimented with a heavier aftermarket trigger spring to increase pull weight, I found the geometry incompatible and had to revert to factory. This isn't a rifle for the tinkerer who wants to swap every internal part; it's a tuned system meant to be used as configured, with modifications largely limited to furniture and optics. I recommend this carbine to the shooter who understands the 6mm ARC's purpose—extending ethical hunting range or competing in gas gun precision matches—and wants a turnkey, suppressor-optimized platform that works out of the box. Skip it if you're on a tight budget, if you primarily shoot inside 200 yards, or if you enjoy building and endlessly customizing every component of your AR. For its intended role, the DISSENT MK4 delivers a level of integrated performance that justifies its complexity and cost. My verdict: it's a purpose-driven tool that executes its design brief with notable competence.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

The CMMG DISSENT MK4 6mm ARC 16.1in Carbine is a purpose-built AR-15 platform rifle engineered to deliver long-range precision ballistics from a carbine-length gas system. This direct-impingement configuration leverages CMMG's Zeroed component series and a side-folding stock to create a hybrid weapon that bridges the gap between tactical maneuverability and reach-sensitive engagements. The platform retains the manual of arms and maintenance procedures familiar to any AR-15 operator, while the 6mm ARC cartridge introduces a new level of external ballistics for intermediate-range target work and hunting.

What is the CMMG DISSENT MK4 used for?

The CMMG DISSENT MK4 is used for precision shooting at distances where 5.56 NATO effectiveness drops off, typically from 300 to 800 yards. Its primary applications are medium-game hunting with appropriate expanding projectiles, competitive shooting in gas gun divisions with extended ranges, and as a dedicated marksman rifle for trained personnel who need more terminal effect than 5.56. The adjustable gas block and side-folding stock make it exceptionally suppressor-ready and packable for vehicle or pack-based operations.

How does the CMMG DISSENT MK4 compare to the Stevens 334 Rifle?

The CMMG DISSENT MK4 is better for rapid follow-up shots and modular accessory mounting, while the Stevens 334 Rifle in .308 Win is better for pure mechanical accuracy and lower cost of entry. The DISSENT MK4 leverages semi-automatic fire, a full-length M-LOK handguard, and ambidextrous controls for dynamic shooting, whereas the bolt-action Stevens 334 offers a simpler, lighter system with a clean barrel for potentially tighter groups. The DISSENT MK4's 6mm ARC will have a flatter trajectory and less recoil than the .308 Winchester, but requires specialized magazines.

What does it weigh and what are the dimensions?

The DISSENT MK4 weighs 7.70 pounds (3.49 kilograms) unloaded without optics, and has a variable overall length due to its folding stock mechanism. With the stock folded, the carbine measures 25.90 inches in length; with the stock fully extended and the cheek riser at its highest position, it measures 36.60 inches. The 16.10-inch barrel has a 1:7.5-inch twist rate, optimized to stabilize the long, heavy 6mm ARC projectiles ranging from 103 to 108 grains commonly used for long-range work.

Who is this NOT for?

This rifle is not for the budget-conscious plinker or someone seeking their first AR-platform firearm. The 6mm ARC is a specialized cartridge with higher per-round cost and limited commercial availability compared to 5.56 NATO or .223 Remington. It's also not ideal for someone unwilling to tune the adjustable gas system, especially if planning to use a suppressor, as improper settings can lead to reliability issues. If your shooting is confined to 200 yards or less, a standard 5.56 rifle like many on the market will be more cost-effective and suitable.

What's in the box?

You receive the complete carbine, one 10-round polymer magazine compliant with various state regulations, and the factory paperwork including a manual and warranty card. CMMG does not include tools for the adjustable gas block, a sling, or any optics—these are considered aftermarket additions for the end user. The muzzle device is the CMMG Zeroed Muzzle Brake installed and torqued to factory specification, which is designed to work with their suppressor lineup or standard 5/8"-24 thread pattern muzzle devices.

Is the CMMG DISSENT MK4 worth it at $2089.99?

At $2089.99, the DISSENT MK4 is worth it for the shooter who specifically needs the performance envelope of 6mm ARC in a reliable, folding-stock AR platform and values CMMG's integrated Zeroed component system. You are paying a premium for the engineered synergy of the barrel, bolt carrier group, and gas system, along with the folding stock mechanism, which would cost significantly more to piece together from aftermarket parts. For the shooter who wants a traditional rifle for similar tasks, a bolt-action like the Stevens 334 in .243 Win can deliver comparable accuracy for less than half the price, but sacrifices semi-auto capability and modularity.

Key attributes

upc	810144721583
manufacturer	CMMG
manufacturer part number	60AA90CMB
barrel length	16.10"
caliber/gauge	6mm ARC
capacity	10 + 1
safety	CMMG Zeroed 60/90 Degree

Frequently asked questions

Does this work with standard AR-15 parts?: The upper and lower receivers, fire control group, and buffer system are proprietary to the CMMG DISSENT design and not compatible with standard AR-15 parts. However, the M-LOK handguard, pistol grip, and castle nut/wrench interfaces use mil-spec dimensions, allowing you to swap those components with common aftermarket options. The barrel uses a standard .750" journal for gas block mounting.
Is it compatible with a suppressor?: Yes, the DISSENT MK4 is engineered for suppressed use. The 16.1" barrel is threaded 5/8"-24, which is the standard for .30 caliber and many 6mm suppressors. The included adjustable gas block has 18 distinct settings, allowing you to tune the system to reduce gas blowback when a suppressor is attached. I recommend starting at setting 8 with a suppressor and working up or down in 2-click increments for reliable cycling.
What kind of accuracy can I expect?: From a mechanical rest with quality 108-grain match ammunition, expect 1.0 to 1.5 MOA (Minute of Angle) groups at 100 yards. This means a 5-shot group will measure between 1.05 and 1.57 inches in diameter. The CMMG Zeroed barrel and single-stage trigger are the primary contributors to this level of precision. Real-world accuracy from field positions will be larger, typically 2-3 MOA for a proficient shooter.
How long does shipping take to an FFL?: Shipping to your selected Federal Firearms License (FFL) holder typically takes 3-5 business days after order processing and compliance verification are complete. All firearms from Ironclad Armory ship via FedEx or UPS with adult signature required and mandatory direct delivery to the licensed premises. You must contact your FFL in advance to provide them with your order number and ensure they will accept the transfer.

Sources & methodology. Editorial review and rating by Declan Vance based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-05-29.