The CMMG Dissent BR4 in 5.56 NATO with a 16.1-inch barrel is a direct-impingement modern sporting carbine built for shooters who demand reliability, adjustability, and ambidextrous control. Chambered for .223 Rem/5.56 NATO, this rifle integrates a reversible side-charging upper, an adjustable gas system, and a ZEROED drop-in single-stage trigger. The matched 7075 T6 aluminum upper and BR4 billet lower receivers wear Cerakote Armor Black. Two Magpul PMAG magazines ship with the rifle. This is a field-ready, tunable platform for law enforcement, military, and serious shooters.
| Manufacturer | CMMG |
|---|---|
| Model | Dissent BR4 |
| Material | 7075 T6 aluminum receivers, steel barrel |
| Compatibility | 223 Rem / 5.56 NATO ammunition; accepts standard AR-15 magazines (two Magpul PMAGs included) |
| Finish | Cerakote Armor Black |
| Weight | 6.8 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Reversible Side-Charging Upper: Allows left- or right-side charging handle placement. Why it matters: Enables quick, intuitive operation without breaking your firing grip, critical under stress.
- Adjustable Gas System: Tune gas flow for suppressed or unsuppressed use. Why it matters: Reduces recoil, minimizes fouling, and ensures reliable cycling across ammunition loads.
- ZEROED Drop-In Single-Stage Trigger: Factory-installed, crisp break with minimal overtravel. Why it matters: Improves shot-to-shot consistency and accuracy without aftermarket upgrades.
- 16.1-Inch Threaded Barrel (1/2×28): Chrome-moly steel, button-rifled, with a low-profile gas block. Why it matters: Provides optimal velocity for 5.56 NATO while accepting standard muzzle devices or suppressors.
- BR4 Billet Lower Receiver: Machined from 7075 T6 aluminum, flared magwell, integrated trigger guard. Why it matters: Enhances reload speed, reduces weight, and offers a rigid foundation for precision.
Who It’s For
This rifle is for law enforcement officers, military personnel, and serious shooters who need a reliable, adjustable carbine for training, patrol, or competition. If you want a factory-tuned platform with ambidextrous controls and a proven gas system, the Dissent BR4 delivers.
Pros/Cons
- Pros: Reversible side charging, adjustable gas system, crisp factory trigger, lightweight billet lower, Cerakote finish resists corrosion.
- Cons: The side-charging handle adds slight width to the upper receiver, which may interfere with some tight-fitting cases or accessories. Also, the ZEROED trigger, while excellent, is not user-adjustable for pull weight.
Comparison vs. Competitors
| Feature | CMMG Dissent BR4 | Geissele Super Duty 16″ | Zev Technologies OZ9C-X |
|---|---|---|---|
| Caliber | 5.56 NATO | 5.56 NATO | 9mm |
| Barrel Length | 16.1″ | 16″ | 4.5″ (pistol) |
| Gas System | Adjustable | Fixed mid-length | Blowback (pistol) |
| Charging Handle | Reversible side | Rear ambi | Rear (pistol slide) |
| Trigger | ZEROED single-stage | Geissele SSA-E two-stage | Zev adjustable |
| Weight | 6.8 lbs | 6.9 lbs | 1.8 lbs |
| Price | $1,922.15 | ~$1,850 | ~$1,600 |
| Best For | Law enforcement, military, tunable field use | Precision shooters, duty use | Competition, concealed carry |
FAQ
What is the barrel twist rate on the CMMG Dissent BR4?
The barrel has a 1:7 twist rate, optimized for stabilizing heavier 5.56 NATO bullets (62-77 grain).
Does the Dissent BR4 come with a muzzle device?
Yes, it includes a CMMG ZEROED muzzle brake, which is also compatible with suppressors via the 1/2×28 threads.
Can I use standard AR-15 magazines with this rifle?
Yes. The Dissent BR4 accepts all standard AR-15 pattern magazines. Two Magpul PMAG 30-round magazines are included.
Is the side-charging handle reversible for left-handed shooters?
Yes. The upper receiver is designed for reversible side charging. You can move the handle to the left or right side without tools.
What is the warranty on the CMMG Dissent BR4?
CMMG offers a limited lifetime warranty on the receiver and a one-year warranty on other components. Contact CMMG for details.
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Last updated: April 2026
According to industry data, direct-impingement AR-15s account for over 70% of the U.S. law enforcement rifle market. The Dissent BR4 is built for that standard.
See also: Semi Auto Rifles | AR-15 Uppers | Magazines
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