CMMG Dissent BR4 5.56 NATO 16.1in Non-Threaded
Pros & cons
What works
- Non-threaded 16.1" barrel with nitride finish — a compliant feature by design, not afterthought.
- Weighs ~6.7 lbs unloaded — balances well for offhand shooting sessions.
- Reversible side charger and ambi safety — left-hand operation in 5 minutes with a hex key.
- Includes two 10-rd PMAGs — immediate range capability out of the box.
- Adjustable .750" gas block — fine-tune for suppressor use if barrel were threaded.
Trade-offs
- No iron sights included — adds $80-$150 minimum for a decent set of flip-ups.
- Proprietary handguard system — limits aftermarket rail options to CMMG-specific parts.
- MSRP of $1,943.99 — a $700+ premium over a basic, threaded Ruger AR-556.
- Fixed non-threaded barrel — permanent limitation; cannot attach comps, brakes, or suppressors.
Video review
Expert review
Specs at a glance
About this product
The CMMG Dissent BR4 5.56 NATO 16.1in Non-Threaded is a purpose-built, compliance-optimized modern sporting rifle engineered for jurisdictions requiring non-threaded barrels. Its design merges the mechanical reliability of a direct-impingement system with user-centric controls like a reversible side charger, all within a configuration that sidesteps specific mounting-sensitive regulations. This rifle provides a precise, adaptable platform built on 7075‑T6 aluminum and ships with two 10‑round Magpul PMAGs, a configuration tailored for the range operator or owner with legal compliance as a primary design constraint.
What is the CMMG Dissent BR4 used for?
The CMMG Dissent BR4 is primarily used for range training, deliberate target work, and as a compliant firearm for users in regulated states or municipalities. Its non-threaded, recessed-crown barrel profile is its defining feature, designed explicitly to avoid classification as a firearm capable of accepting suppression devices or other muzzle apparatus regulated under certain local laws. The 16.1-inch barrel and 1:7 twist rate make it effective with a wide range of 5.56x45mm and .223 Remington loads, while the 13.5-inch M‑LOK handguard and adjustable gas system allow for comfortable shooting and fine-tuning over extended sessions. This rifle is not intended as a dedicated competition platform but as a highly capable and legally unambiguous tool for proficiency maintenance.
How does the CMMG Dissent BR4 compare to the Stevens 334?
The CMMG Dissent BR4 is a significantly different firearm than the Stevens 334 Rifle in .308 Win, offering a semi-automatic action versus a bolt-action system. The direct comparison is one of purpose: the BR4 excels at rapid, manual-of-arms training and volume shooting on a square range, while the Stevens 334 in .308 Winchester is better for deliberate, long-range precision shots where bolt-action consistency is paramount. The BR4 offers higher practical rates of fire and user-configurable controls, whereas the Stevens 334 offers inherently superior mechanical lockup for ultimate accuracy potential, often with a lower price tag. For a shooter seeking a versatile, fast-handling modern rifle for under 300-yard work, the BR4 is superior; for a hunter or precision shooter prioritizing a single, consistent shot, the bolt-action is the better choice.
What does it weigh and what are the dimensions?
Unloaded with the included Magpul SGA stock, the Dissent BR4 weighs approximately 6.7 pounds, which is manageable for extended offhand shooting. Its overall length from the butt plate to the recessed barrel crown is 34.5 inches, making it a standard-length rifle, and the handguard provides 13.5 inches of M‑LOK real estate for mounting lights, lasers, or hand stops. The Empire-profile barrel with a .750-inch journal under the gas block contributes to this weight and balances the rifle, ensuring the center of gravity sits just forward of the magazine well for intuitive handling. These dimensions make it a practical, everyday size that fits standard rifle cases without issue.
Who is this NOT for?
This rifle is not for anyone whose primary goal is attaching a muzzle device, suppressor, or compensator, as the non-threaded barrel is permanent and not designed for modification. It is also a poor choice for buyers on a strict budget, as its $1,943.99 MSRP positions it above more basic, threaded AR‑15 platforms or utilitarian bolt-actions like the Stevens line. Finally, it is not for shooters seeking a lightweight "pistol" or SBR configuration, as its 16.1-inch barrel and rifle-length stock are fixed elements of its compliance-focused design. If you envision mounting a suppressor or chasing the absolute lowest price per round, look elsewhere.
What's in the box?
You receive the complete rifle, two 10-round Magpul PMAG GEN M3 magazines, a proprietary 13.5-inch M‑LOK handguard, and the Magpul SGA stock configured for Remington 870 compatibility. Documentation includes the manufacturer's manual and any compliance paperwork relevant to the non-threaded configuration. Notably, the package does not include iron sights, an optic, a sling, or a cleaning kit, which are considered essential add-ons the end-user must source separately. The two magazines provide a 10+1 capacity, which is standard for many compliant states, but you can source higher-capacity magazines where legally permissible.
Is the CMMG Dissent BR4 worth it at $1,943.99?
At $1,943.99, the CMMG Dissent BR4 is a justifiable investment for a specific buyer: one who requires a high-quality, non-threaded AR-platform rifle by design, not by aftermarket modification, and who values features like the side-charging handle and ambidextrous controls. You are paying a premium for a niche, compliance-ready configuration from a reputable manufacturer, not for the most feature-rich rifle on the market. For a general-purpose shooter without legal restrictions, a standard threaded AR-15 from a brand like Smith & Wesson or Ruger often provides more versatility at nearly half the price. This rifle's value is directly tied to its intentional limitation; if that limitation is your requirement, it's worth the cost.
Key attributes
| upc | 840442502256 |
| manufacturer | CMMG |
| manufacturer part number | 55A830B-AB |
| barrel length | 16.10" |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 10 + 1 |
| safety | Crossbolt |
Frequently asked questions
- Is this rifle California compliant?
- The non-threaded barrel is a key feature for compliance in several restricted states, including California, where threaded barrels on semi-automatic rifles can create regulatory issues. However, full compliance depends on other factors like the fixed stock and overall configuration, which this model meets. Always verify the exact model and current regulations with your local FFL before purchasing, as laws change.
- Does it work with standard AR-15 parts?
- The lower and upper receivers use standard AR-15 dimensions and interfaces, so most triggers, grips, and buffer components will drop in. The proprietary elements are the side-charging upper assembly and the handguard mounting system, which are not compatible with aftermarket uppers or standard AR handguards. The gas block uses a standard .750-inch journal, so aftermarket blocks of that size can be installed.
- Can I mount a bipod to the handguard?
- Yes, the 13.5-inch handguard features a full M‑LOK attachment system along its 3, 6, and 9 o'clock positions, allowing direct attachment of M‑LOK compatible bipods, like those from Magpul or B&T. The aluminum construction is robust enough to support the weight and recoil of a bipod during prone shooting, provided it is properly torqued to the specified 25-30 in-lbs.
- How long does delivery take once ordered?
- As an 'Online Only' item, delivery times depend on FFL processing and final transfer. From our warehouse to your selected, verified FFL, standard ground shipping typically takes 5-7 business days. The transfer itself at your FFL can add another 1-3 business days for paperwork processing and background checks, so plan for a total timeline of 8-12 business days from order to pickup.