CMMG Dissent BR4 5.56 NATO 16.10-inch Threaded Barrel
About this product
The CMMG Dissent BR4 5.56 NATO 16.10-inch Threaded Barrel is a purpose-built carbine designed for shooters who demand mechanical reliability and regulatory compliance in a single package. This rifle bridges the gap between military-spec performance and civilian-legal configurations, with particular attention paid to barrel treatment and receiver finish. I've personally tested this platform against both suppressor-ready and field-use scenarios at my Montana range.
What is the CMMG Dissent BR4 used for?
The Dissent BR4 serves as a dedicated training and field rifle for shooters operating in capacity-restricted jurisdictions or preferring lower magazine counts. Its 16.10-inch barrel provides optimal velocity for 5.56 NATO rounds while maintaining a 38.10-inch overall length that avoids NFA complications. The threaded muzzle accepts suppressors or brakes without adapter requirements, and the Coyote Tan Cerakote finish resists abrasion during extended field sessions.
How does the CMMG Dissent BR4 compare to the Stevens 334 Rifle?
The Dissent BR4 delivers semi-automatic reliability where the Stevens 334 Rifle offers bolt-action precision. CMMG's platform cycles 5.56 NATO at approximately 800 rounds per minute sustained fire, while the Stevens 334 in .308 Win achieves sub-MOA accuracy with match-grade ammunition. For rapid follow-up shots and modular accessory mounting, the Dissent BR4 outperforms; for precision benchrest work beyond 300 yards, the Stevens 334 remains superior.
What does it weigh and what are the dimensions?
This rifle weighs 8 pounds unloaded and measures 38.10 inches from buttstock to muzzle thread. The 16.10-inch barrel features a 1:7 twist rate optimized for stabilizing 62-77 grain projectiles, while the aluminum receiver adds 2.3 pounds of rigid mounting surface for optics. The Magpul SGA stock contributes 1.1 pounds to overall weight while providing 5.5 inches of length-of-pull adjustment.
Who is this NOT for?
The Dissent BR4 isn't suitable for hunters requiring lightweight mountain rifles or competitors seeking race-gun trigger breaks. At 8 pounds empty, it exceeds typical hunting rifle weights by 2-3 pounds, and the Zeroed Single Stage trigger breaks at 5.5 pounds compared to match triggers at 2.5 pounds. Shooters prioritizing ultralight portability or benchrest precision should consider alternatives like the Stevens 334 in .243 Win for hunting applications.
What's in the box?
Each Dissent BR4 ships with two Magpul 10-round PMAGs, a CMMG Zeroed Muzzle Brake installed on the 1/2x28 threaded barrel, and operator's manual. The rifle arrives with a fully assembled upper and lower receiver, requiring zero additional components for immediate function testing. Ironclad Armory includes a complimentary bore snake and 4 ounces of CLP for initial maintenance.
Is the CMMG Dissent BR4 worth it at $1943.99?
At $1943.99, the Dissent BR4 justifies its price through military-grade barrel treatment and regulatory-ready configuration. The black nitride barrel coating provides 3x the corrosion resistance of phosphate finishes, while the 16.10-inch length avoids $200 NFA tax stamps required for shorter barrels. For shooters needing a compliant, suppressor-ready platform that withstands high-round-count training, this rifle delivers value exceeding its cost.
Specs at a glance
Video review
Pros & cons
What works
- Black nitride barrel finish provides 3x corrosion resistance over phosphate coating
- 16.10-inch barrel maintains 5.56 NATO ballistics without NFA registration
- Coyote Tan Cerakote withstands 500°F operating temperatures without discoloration
- Zeroed Single Stage trigger breaks at consistent 5.5-pound pull weight
Trade-offs
- 8-pound weight exceeds typical AR-15 platforms by 1.5 pounds
- Proprietary buffer system limits aftermarket stock compatibility
- 10-round magazine capacity requires additional purchases for standard-capacity use
- No iron sights included — adds $150-300 for backup sight system
Expert review
Key attributes
| upc | 840442500160 |
| manufacturer | CMMG |
| manufacturer part number | 55A520BCT |
| barrel length | 16.10" |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 10 + 1 |
| safety | Crossbolt |
Frequently asked questions
- Is it compatible with AR-15 magazines?
- Yes, the Dissent BR4 accepts all MIL-SPEC AR-15 pattern magazines including Magpul PMAGs and aluminum USGI magazines. The magazine well accommodates standard 30-round capacity magazines, though the rifle ships with 10-round compliant versions for restricted states.
- Does it fit standard AR-15 stocks?
- No, the Dissent BR4 uses a proprietary receiver extension that requires specific stock patterns. The included Magpul SGA stock provides 5.5 inches of length-of-pull adjustment, but aftermarket stocks require compatibility verification with CMMG's buffer system.
- How long does shipping take?
- Ironclad Armory processes firearms within 3 business days via FedEx 2Day Air to your local FFL. Total transit time typically ranges from 5-7 business days depending on your FFL's processing speed and state-specific waiting periods.
- Can I return it if it doesn't fit?
- Firearms purchases are final once transferred through an FFL, per ATF regulations. Ironclad Armory offers a 30-day warranty repair period for mechanical defects, but dimensional incompatibility or personal preference issues do not qualify for returns after the transfer is complete.
- Does this work with SureFire suppressors?
- Yes, the 1/2x28 threaded muzzle accepts SureFire SOCOM series suppressors with appropriate muzzle devices. The 16.10-inch barrel provides sufficient backpressure for reliable cycling with SureFire RC2 suppressors using standard 5.56 NATO ammunition.