The CMMG Dissent BR4 300 AAC Blackout 14.5in 10+1 is a purpose-built ranch and utility rifle that ditches the frills and gets straight to work. Chambered in .300 AAC Blackout, it pairs a compact, reliable AR-style platform with a coyote tan Cerakote finish that shrugs off weather and hard use. The 14.50-inch black nitride threaded barrel, capped with a pinned and welded P&W CMMG Zeroed SVD muzzle brake, keeps the overall length legal without a tax stamp while still taming recoil for quick follow-up shots. Two Magpul 10-round PMAGs come in the box, and the Magpul SGA synthetic stock gives you a solid, no-slip cheek weld whether you’re in the saddle or behind a truck tailgate.
| Manufacturer | CMMG |
|---|---|
| Model | Dissent BR4 |
| Material | Aluminum Picatinny-rail receiver |
| Compatibility | AR-style lower receivers, .300 AAC Blackout magazines |
| Finish | Coyote tan Cerakote |
| Weight | 6.8 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Pinned and Welded Muzzle Brake: The CMMG Zeroed SVD brake is permanently attached to the 14.5-inch barrel, bringing overall length to 16 inches so you skip the NFA wait and still get a compact rifle that handles brush and cab work.
- 300 AAC Blackout Chambering: This round gives you the punch of a .30-caliber in a short barrel, cycling supersonic and subsonic loads without a hiccup — perfect for taking coyotes or dropping a hog at close range without blowing out your ears.
- Magpul SGA Stock: The SGA synthetic stock adjusts for length of pull and comb height, so you get a custom fit whether you’re wearing a heavy coat or a light shirt. It’s tough, lightweight, and won’t crack in cold weather.
- Coyote Tan Cerakote Finish: This isn’t just for looks — the Cerakote resists rust, scratches, and the kind of mud and dust you kick up on a daily ranch run. It stays functional even when you don’t have time to baby your gear.
- Two Magpul 10-Round PMAGs Included: You get two reliable, drop-free magazines right out of the box. No hunting for extras, no cheap plastic that fails in the field.
Who It’s For
This rifle is for the rancher, the rural worker, or the utility shooter who needs a dependable tool for predator control, varmint dispatch, and property defense. It’s not a safe queen — it’s a get-it-done gun that rides in a truck rack or hangs on a saddle scabbard without complaint. If you value reliability over flash, this is your rifle.
Pros and Cons
- Pros: Compact 14.5-inch barrel with pinned brake avoids NFA paperwork; .300 Blackout handles both supersonic and subsonic ammo; Cerakote finish stands up to weather; Magpul stock and mags are proven tough.
- Cons: The pinned and welded brake means you can’t swap muzzle devices without gunsmith work — if you plan to suppress, you’ll need to factor in a dedicated suppressor mount or a different barrel setup.
Comparison
| Feature | CMMG Dissent BR4 | Zev Technologies OZ9C | Geissele Super Duty |
|---|---|---|---|
| Caliber | .300 AAC Blackout | 9mm | 5.56 NATO |
| Barrel Length | 14.5 inches | 4.5 inches | 16 inches |
| Finish | Coyote Tan Cerakote | Black Nitride | Black Anodized |
| Stock | Magpul SGA | Polymer grip (pistol) | Geissele Super 42 |
| Weight | 6.8 lbs | 2.1 lbs | 7.2 lbs |
| Price | $1,922.15 | $1,899.00 | $2,099.00 |
FAQ
What is the barrel twist rate on the CMMG Dissent BR4?
Per CMMG specs, the 14.5-inch barrel has a 1:7 twist rate, which stabilizes both supersonic and subsonic .300 Blackout loads effectively.
Does the CMMG Dissent BR4 come with a warranty?
Yes, CMMG backs this rifle with a limited lifetime warranty against defects in materials and workmanship for the original owner.
Can I mount a suppressor on the CMMG Dissent BR4?
Yes, but because the muzzle brake is pinned and welded, you’ll need to remove it or use a suppressor that mounts directly to the brake. Some users swap the entire barrel for a dedicated suppressed setup.
What magazines are compatible with this rifle?
It accepts standard AR-pattern .300 AAC Blackout magazines. The included Magpul PMAGs are the gold standard, but any quality 5.56/.300 mag will work.
Is the CMMG Dissent BR4 legal in all states?
It’s a 10+1 capacity with a pinned 14.5-inch barrel, so it’s NFA-compliant. Check local laws on .300 Blackout and magazine capacity — some states have restrictions.
- ✓ Nationwide delivery (all 50 states)
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Last updated: April 2026
Explore more in our AR Rifles collection, or check out .300 Blackout Ammunition and AR Parts to complete your setup.
FFL Transfer & Firearms Laws for CMMG Dissent BR4 300 AAC Blackout 14.5in 10+1
All firearms, including the CMMG Dissent BR4 300 AAC Blackout 14.5in 10+1, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the CMMG Dissent BR4 300 AAC Blackout 14.5in 10+1 is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
Frequently Asked Questions About This Product
Why buy CMMG Dissent BR4 300 AAC Blackout 14.5in 10+1 from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy CMMG Dissent BR4 300 AAC Blackout 14.5in 10+1?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is CMMG Dissent BR4 300 AAC Blackout 14.5in 10+1 available now?
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What category does this product belong to?
This product is listed under: AR Rifles.
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Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.




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