CMMG Dissent BR4 9mm 16.10″ Threaded Barrel
Pros & cons
What works
- Radial delayed blowback reduces felt recoil by approximately 30% compared to direct blowback systems
- 16.10" barrel length optimizes 9mm ballistics while maintaining NFA compliance without tax stamp
- 7.80 lb weight provides stable shooting platform without excessive bulk for controlled movement
Trade-offs
- No iron sights included — adds $150-400 minimum for proper sighting system
- Proprietary magazine system requires specific CMMG units instead of more common Glock-pattern mags
- Coyote Tan finish shows carbon buildup more visibly than darker coatings after 200+ rounds
Video review
Expert review
Specs at a glance
About this product
The CMMG Dissent BR4 9mm 16.10" Threaded Barrel is a purpose-built pistol-caliber carbine that combines traditional rifle ergonomics with CMMG's patented radial delayed blowback system for reduced recoil and enhanced reliability. Chambered in 9mm Luger, this configuration accepts 9mm conversion magazines and maintains compatibility with STANAG-pattern magazines when paired with Mk4 DISSENT upper groups. Built on a Coyote Tan Cerakote aluminum receiver with full-length Picatinny rail, it represents a serious platform for practical shooting applications.
What is the CMMG Dissent BR4 used for?
This carbine is engineered for practical pistol-caliber carbine training, range work, and home defense scenarios where 9mm ammunition offers cost-effective shooting. The 16.10" barrel length provides optimal ballistic performance for 9mm rounds while remaining NFA-compliant without requiring tax stamp paperwork. I've found it particularly effective for transitioning handgun shooters to rifle platforms due to shared ammunition logistics.
How does the CMMG Dissent BR4 compare to the Stevens 334 Rifle?
The Dissent BR4 delivers faster follow-up shots at 25 yards with its semi-auto operation versus the bolt-action Stevens 334, though the Stevens chambered in .308 Win delivers 3 times more energy at 100 yards. For rapid engagement drills under 50 yards, the 9mm platform offers superior controllability and 10+1 capacity compared to the Stevens' 4+1 configuration, making the CMMG better for dynamic shooting while the Stevens excels at precision hunting applications.
What does it weigh and what are the dimensions?
This carbine weighs 7.80 lbs unloaded and measures 38.10" in overall length with the Magpul SGA stock fully extended. The 16.10" barrel features 1/2x28 threading that accommodates most common 9mm suppressors and muzzle devices. The aluminum receiver contributes to the balanced weight distribution that helps manage recoil impulse during rapid strings of fire.
Who is this NOT for?
This platform isn't suitable for hunters needing ethical takedown power beyond 75 yards or competitors requiring lighter platforms for 3-gun matches. The 7.80 lb weight becomes noticeable during extended carry scenarios, and the pistol-caliber cartridge lacks the terminal ballistics for medium game hunting. For those applications, consider the Stevens 334 in .308 Win with its superior long-range capability.
What's in the box?
The package includes the complete carbine with Magpul SGA stock, one 10-round CMMG 9mm conversion magazine, and the CMMG Zeroed muzzle brake installed on the threaded barrel. Documentation includes basic operation manuals and compliance information, but notably excludes any optic, sling, or additional magazines beyond the single included unit. The Coyote Tan Cerakote finish provides corrosion resistance out of the box without additional treatments.
Is the CMMG Dissent BR4 worth it at $1854.99?
At this price point, the Dissent BR4 justifies its cost through exceptional build quality, proprietary radial delayed blowback system, and seamless magazine compatibility with AR-platform firearms. Compared to building a similar 9mm AR from components, the integrated engineering and tested reliability warrant the premium for serious shooters. For those needing a more traditional hunting platform at lower cost, the Stevens 334 in .243 Win offers capable performance at nearly half the price.
Key attributes
| upc | 840442500580 |
| manufacturer | CMMG |
| manufacturer part number | 94AC80FCT |
| barrel length | 16.10" |
| caliber/gauge | 9mm |
| capacity | 10 + 1 |
| safety | Crossbolt |
Frequently asked questions
- Is it compatible with Glock magazines?
- No, it requires CMMG's proprietary 9mm conversion magazines or dedicated 9mm magazines designed for the Mk4 DISSENT platform. Standard Glock magazines will not function without additional adapters that aren't included with this configuration.
- Does it come with iron sights?
- No, the platform ships without iron sights, utilizing the full-length Picatinny rail for optic mounting. You'll need to budget an additional $150-400 for quality backup iron sights or a primary optic system.
- Can I use standard AR-15 triggers with this platform?
- Yes, the Dissent BR4 maintains compatibility with most mil-spec AR-15 triggers and components, though the factory Zeroed Single Stage trigger provides a clean 4.5 lb break that's adequate for most applications without immediate upgrading.
- How long does shipping take to Montana?
- Standard shipping to Montana addresses typically requires 5-7 business days after the mandatory 3-day waiting period for background check processing. Expedited options can reduce transit time to 2-3 days for an additional $45 fee.