The CMMG DISSENT BR4 .300 AAC Blackout 16.1″ Armor Black is a purpose-built carbine that balances suppressed shooting versatility with full-length barrel ballistics. Chambered in .300 AAC Blackout, this semi-automatic rifle features a 16.1-inch threaded barrel, an adjustable gas block, and a Magpul SGA stock for immediate use. With 7075 T6 aluminum receivers and ambidextrous controls, it delivers reliable performance for family shooters and new enthusiasts alike.
| Manufacturer | CMMG |
|---|---|
| Model | DISSENT BR4 |
| Caliber | .300 AAC Blackout |
| Barrel Length | 16.1 inches |
| Material | 7075 T6 Aluminum receivers |
| Handguard | M-LOK |
| Finish | Cerakote Armor Black |
| Magazines | Two Magpul 10-round PMAGs |
| Stock | Magpul SGA synthetic stock |
| Weight | Approximately 7.5 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- 16.1-inch threaded barrel — Gives you the legal length to attach a suppressor without extra paperwork, while still delivering solid velocity for subsonic and supersonic loads.
- Adjustable gas block — Lets you tune the rifle for suppressed or unsuppressed shooting, reducing recoil and keeping the action running smoothly for new shooters.
- Magpul SGA stock and two 10-round PMAGs — Comes ready to shoot out of the box with a comfortable, adjustable stock and reliable magazines that won’t let you down.
- Ambidextrous controls — Safety selector and magazine release are built for left- and right-handed shooters, making this a great choice for teaching family members of all skill levels.
- Full-length top Picatinny rail — Gives you plenty of space to mount optics, red dots, or backup sights without crowding, keeping your setup clean and easy to use.
Who It’s For
This carbine is ideal for families and beginner shooters who want a versatile .300 Blackout rifle that can handle both quiet training loads and defensive ammunition. Its adjustable gas block and ambidextrous controls make it a forgiving platform for learning the basics of AR-style shooting. Experienced owners will appreciate the build quality and the ability to run suppressed without manual tuning.
Pros and Cons
- Pro: Ready to shoot with two PMAGs and a quality stock — no extra purchases needed for range day.
- Pro: Adjustable gas block lets you dial in performance for different loads and suppressor use.
- Pro: 7075 T6 aluminum receivers provide a durable foundation that will last through years of training.
- Con: The 16.1-inch barrel is slightly longer than some .300 Blackout carbines, which may feel front-heavy for smaller shooters until they adjust to the balance.
Comparison: CMMG DISSENT BR4 vs. Geissele Super Duty vs. Zev Technologies
| Feature | CMMG DISSENT BR4 | Geissele Super Duty | Zev Technologies |
|---|---|---|---|
| Caliber | .300 AAC Blackout | 5.56 NATO | 5.56 NATO |
| Barrel Length | 16.1″ | 16″ | 16″ |
| Gas Block | Adjustable | Fixed | Fixed |
| Stock | Magpul SGA | Geissele Super 42 | Zev stock |
| Weight | ~7.5 lbs | ~6.5 lbs | ~6.8 lbs |
| Ambidextrous Controls | Yes | Partial | Yes |
| Suppressor Ready | Yes (adjustable gas block) | Not optimized | Not optimized |
According to CMMG specs, the DISSENT BR4 is one of the few production .300 Blackout carbines with a factory-adjustable gas block. For families who plan to shoot both subsonic and supersonic rounds, this feature alone makes it more versatile than fixed-gas competitors.
FAQ
What is the barrel twist rate on the CMMG DISSENT BR4 .300 AAC Blackout 16.1″ Armor Black?
The barrel has a 1:7 twist rate, which stabilizes both subsonic and supersonic .300 Blackout bullets effectively. Per manufacturer specs, this twist works well with 110- to 220-grain loads.
Does the CMMG DISSENT BR4 come with a muzzle device?
Yes, the rifle ships with a flash hider installed on the threaded barrel. The barrel is 5/8×24 threaded, so you can easily swap it for a suppressor or compensator.
Can I use standard AR-15 magazines with this rifle?
Yes, the DISSENT BR4 accepts standard AR-15 magazines. It ships with two Magpul 10-round PMAGs, but you can use any 5.56/.300 Blackout magazine that fits the AR-15 platform.
Is the CMMG DISSENT BR4 legal to own in all states?
This model has a 16.1-inch barrel and a fixed stock, so it meets federal rifle length requirements. However, some states have magazine capacity restrictions—the included 10-round PMAGs comply with most state laws. Check your local regulations before purchase.
Why Buy from Us
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Explore more options in our AR Rifles category, or see our .300 Blackout Rifles for similar builds. For accessories, check the AR Parts section.
Last updated: April 2026. Over 60% of new shooters prefer .300 Blackout for its versatility according to industry surveys.
FFL Transfer & Firearms Laws for CMMG DISSENT BR4 .300 AAC Blackout 16.1″ Armor Black
All firearms, including the CMMG DISSENT BR4 .300 AAC Blackout 16.1″ Armor Black, 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 16.1″ Armor Black 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 16.1″ Armor Black 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 16.1″ Armor Black?
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 16.1″ Armor Black available now?
Availability is shown live on this page. If the “Add to Cart” button is visible, this item is currently in stock and ready to ship.
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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FFL Transfer & Firearms Laws
All firearms, including the CMMG DISSENT BR4 .300 AAC Blackout 16.1″ Armor Black, must be shipped to a licensed Federal Firearms License (FFL) dealer. A background check and any required local paperwork must be completed before you can take possession.
How It Works
- Place your order online.
- Send us your preferred local FFL dealer info.
- We ship the firearm to your FFL after verification.
- Complete background check and pick up from your dealer.
Legal Compliance
We comply with all U.S. firearm laws. It is your responsibility to ensure the CMMG DISSENT BR4 .300 AAC Blackout 16.1″ Armor Black is legal in your state. Some states (e.g. CA, NY, NJ) have restrictions on magazine size or certain features.
Helpful Links
Need help? Contact our team — we’ll guide you through selecting a compliant firearm and the FFL transfer process.
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