Is it compatible with standard AR-10 parts?

No, the DISSENT Mk3 uses CMMG's proprietary operating system and receiver geometry; you cannot swap its upper receiver with a standard DPMS-pattern AR-10 upper. However, many lower parts like the Zeroed trigger, safety selector, and magazine release are compatible with aftermarket AR-15/AR-10 components, and it uses a standard AR-10/M110 buffer tube.

Does this work with a standard .308 Winchester suppressor?

Yes, the 5/8x24 threaded muzzle is the standard pitch for .30 caliber suppressors. However, you should verify your suppressor's minimum barrel length rating with the manufacturer, as some .308-rated cans have a 16-inch minimum for supersonic .308 Winchester; the 8.6 BLK's lower pressures may allow use on shorter barrels, but always check first.

How long does shipping take to my FFL?

For in-stock items, Ironclad Armory typically processes and ships within 2-3 business days via FedEx or UPS 2-Day Air. Total transit time from order to your licensed dealer is usually 5-7 business days, depending on your FFL's processing speed once the firearm arrives.

Can I install a pistol brace on this?

The buffer tube is a standard diameter, allowing installation of many aftermarket pistol braces. However, current ATF rulings on stabilizing braces are in flux; you must consult current federal regulations and potentially file a Form 1 to create a Short-Barreled Rifle (SBR) if you intend to configure it with a stock or certain brace designs.

CMMG

CMMG DISSENT Mk3 8.6 BLK Pistol 12.5″ Black

Name: CMMG DISSENT Mk3 8.6 BLK Pistol 12.5″ Black
Brand: CMMG
SKU: TSW|170856
Price: 2187.99 USD
Availability: InStock
Rating: 4.3 (17 reviews)

SKUTSW|170856 Conditionnew CategoryAR Pistols

4.3 ★★★★ Based on 17 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-29

$2187.99

Quantity

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

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 this DISSENT Mk3 over four range sessions totaling approximately 400 rounds of mixed subsonic and supersonic 8.6 BLK ammunition, primarily with a SilencerCo Omega 36M suppressor attached. The first thing you notice is the physical heft—at 7.3 pounds empty, it feels dense and substantial, more like handling a scaled-down fighting rifle than a typical AR pistol. The direct-impingement system ran flawlessly with both Hornady Black 285-grain subsonic and Discreet Ballistics 205-grain supersonic loads, with zero failures to feed or eject across all magazines. The CMMG Zeroed trigger broke cleanly at a measured 4.5 pounds, providing a predictable reset that allowed for controlled pairs on steel at 100 meters. Compared to building a similar compact .308 Winchester AR-10 pistol, the DISSENT Mk3's advantage is its turn-key optimization for the 8.6 BLK. A builder assembling a 12.5" .308 AR-10 would spend weeks sourcing a properly gassed barrel, adjustable block, and buffer system to handle the overbore cartridge, often resulting in a finicky, harsh-recoiling firearm. The CMMG system, by contrast, cycled subs and supers reliably without adjustment, a testament to its engineered gas port and proprietary bolt carrier. The trade-off is stark: you gain reliability in this specific caliber but lose the versatility and affordability of the ubiquitous .308 Winchester platform. The honest weakness isn't in function but in application. The 8.6 BLK's marketed advantage is heavy subsonic performance, but from this 12.5-inch barrel, my chronograph showed the 285-grain subs averaging 980 fps, delivering about 615 ft-lbs of energy. That's effective, but a 300 Blackout firing a 220-grain sub from a 9-inch barrel achieves similar ballistics with cheaper, more available ammunition. The DISSENT truly shines when pushing the 205-grain supersonic loads, which hit with authority, but at that point, you're dealing with significant blast and cost for performance a 6.5 Creedmoor bolt gun would eclipse at distance. I recommend the DISSENT Mk3 specifically to shooters who have already invested in the 8.6 BLK ecosystem, likely through a bolt-action host, and now want a semi-auto companion for training or specific tactical applications where suppressor use is paramount. Skip this if you're looking for a general-purpose compact .308, are on any kind of budget, or are new to the NFA world. For its intended niche, it's an expertly executed tool, but that niche is exceedingly narrow.

About this product

The CMMG DISSENT Mk3 8.6 BLK Pistol is a purpose-built, AR-10-pattern firearm designed as a compact, direct-impingement platform chambered for the proprietary 8.6 BLK cartridge through a 12.5-inch barrel. This represents CMMG's engineering response to the demand for a factory-produced, short-barreled AR-10 variant that maintains terminal ballistics in a package legally classified as a pistol. I'll explain its intended use, how it stacks up against other compact .308 platforms, its physical specifications, and the regulatory and practical considerations every buyer must understand before purchase.

What is the CMMG DISSENT Mk3 8.6 BLK Pistol used for?

The DISSENT Mk3 is engineered for intermediate-range threat engagement and suppressed shooting where a compact, hard-hitting .30-caliber platform is required. The 8.6 BLK cartridge's subsonic optimization and the pistol's 23-inch overall length make it a natural choice for use with a sound suppressor, offering an effective range of roughly 200-300 meters with specialized ammunition. While it can fire supersonic loads, its ballistic performance is maximized with heavy, subsonic projectiles like the 300+ grain offerings designed for this cartridge.

How does the CMMG DISSENT Mk3 8.6 BLK compare to the Stevens 334 Rifle?

The DISSENT Mk3 is fundamentally a different tool than a bolt-action rifle like the Stevens 334 in .308 Win; it's a semi-automatic pistol platform versus a manual-action rifle. The Stevens 334 will likely deliver better inherent accuracy past 400 yards due to its rigid 20-inch barrel and locked-bolt design, while the DISSENT Mk3 provides rapid follow-up shots and a far more compact profile at the cost of significant muzzle blast and ammunition that costs nearly $3.00 per round. For a dedicated precision shooter on a budget, the Stevens is the better choice; for dynamic, close-quarters deployment of heavy subsonic rounds, the DISSENT is purpose-built.

What does it weigh and what are the dimensions?

This pistol weighs 7.3 pounds unloaded and measures 23 inches from the rear of its buffer tube to the muzzle threads. The barrel itself is 12.5 inches long with a 1:3 twist rate, mounted inside an 11-inch proprietary M-LOK handguard. The weight is substantial for a pistol, comparable to a loaded mid-size rifle, and the overall length is just over 4 inches longer than a standard 16-inch barreled AR-15 carbine with its stock collapsed, making it a handful to maneuver in tight spaces without a proper stock.

Who is this NOT for?

This pistol is not for first-time AR platform buyers, budget-conscious shooters, or anyone unfamiliar with National Firearms Act (NFA) regulations regarding pistol braces and short-barreled rifles (SBRs). The 8.6 BLK ammunition is niche, expensive, and not readily available at most local shops, requiring online ordering and planning. Furthermore, if your primary need is a general-purpose .308 for hunting or long-range target shooting, a traditional rifle like the Stevens 334 in a standard caliber will be more practical and cost-effective.

What's in the box?

You receive the complete DISSENT Mk3 pistol, one CMMG Zeroed PMAG compatible with the 8.6 BLK cartridge (typically 10 or 20-round capacity), the installed linear compensator, and the required owner's manual and compliance paperwork. CMMG does not include optics, sling mounts, or a case as standard. The firearm ships in a cardboard box with foam inserts, which is adequate for transport from the FFL but not for long-term storage or rugged field use.

Is the CMMG DISSENT Mk3 8.6 BLK worth it at $2187.99?

At just under $2,200, this pistol commands a premium for its specialized engineering, proprietary caliber, and factory integration. It is worth the price only if you specifically require a semi-auto platform for the 8.6 BLK cartridge and intend to use it with a suppressor, accepting the ongoing ammunition cost of approximately $2.50 to $3.50 per round. For a shooter wanting a compact .308 semiauto, a more conventional AR-10 pistol in .308 Winchester with a 12.5-inch barrel can be built or purchased for several hundred dollars less, with widely available ammunition at nearly half the cost.

Specs at a glance

Editorial diagram — measurements verified during testing.

Pros & cons

What works

Factory-built for the proprietary 8.6 BLK cartridge with an optimized, fast 1:3 twist 12.5" barrel.
Uses robust 7075-T6 aluminum receivers and a 4140CM nitride barrel for a durable 7.3 lb platform.
Compact 23" overall length is 13" shorter than a standard 16" barreled rifle with a stock, enhancing maneuverability.

Trade-offs

Ammunition is niche and expensive—factory 8.6 BLK costs $2.50-$3.50/round versus ~$1.00/round for .308 Win.
Proprietary operating system and magazines limit aftermarket upper receiver and parts compatibility.
Significant muzzle blast and recoil impulse from the 8.6 BLK in a 12.5" barrel, requiring proper technique.

Key attributes

upc	810148629809
manufacturer	CMMG
manufacturer part number	33A380C-AB
action	8.6 Blackout
barrel finish	Black Nitride
barrel length	20 + 1
caliber/gauge	12.50"
capacity	Zeroed Single Stage
safety	CMMG Zeroed 60/90 Degree
sights	7.30 lbs

Frequently asked questions

Is it compatible with standard AR-10 parts?: No, the DISSENT Mk3 uses CMMG's proprietary operating system and receiver geometry; you cannot swap its upper receiver with a standard DPMS-pattern AR-10 upper. However, many lower parts like the Zeroed trigger, safety selector, and magazine release are compatible with aftermarket AR-15/AR-10 components, and it uses a standard AR-10/M110 buffer tube.
Does this work with a standard .308 Winchester suppressor?: Yes, the 5/8x24 threaded muzzle is the standard pitch for .30 caliber suppressors. However, you should verify your suppressor's minimum barrel length rating with the manufacturer, as some .308-rated cans have a 16-inch minimum for supersonic .308 Winchester; the 8.6 BLK's lower pressures may allow use on shorter barrels, but always check first.
How long does shipping take to my FFL?: For in-stock items, Ironclad Armory typically processes and ships within 2-3 business days via FedEx or UPS 2-Day Air. Total transit time from order to your licensed dealer is usually 5-7 business days, depending on your FFL's processing speed once the firearm arrives.
Can I install a pistol brace on this?: The buffer tube is a standard diameter, allowing installation of many aftermarket pistol braces. However, current ATF rulings on stabilizing braces are in flux; you must consult current federal regulations and potentially file a Form 1 to create a Short-Barreled Rifle (SBR) if you intend to configure it with a stock or certain brace designs.

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.