Forget everything you thought you knew about Pistol Caliber Carbines, the 9mm DISSENT Br4 redefines the category by combining classic rifle ergonomics with the proven performance of CMMG's Radial Delayed Blowback system and a fixed ejector for enhanced reliability. Designed to run on CMMG's 9mm AR conversion magazines, the Br4 lower also offers incredible versatility by accepting standard STANAG pattern magazines when paired with a compatible Mk4 DISSENT upper. Whether you're building the ultimate PCC or planning for future caliber changes, the DISSENT Br4 delivers innovation without compromise.

Designed for compliance, this is the rifle for restricted states, delivering performance without compromising legality
The Br4 offers firearm owners in restrictive, 2A-unfriendly states a modern and capable carbine option, combining compliance with performance
By blending traditional controls and familiar ergonomics with cutting-edge engineering, the Br4 is ready for hunting, self-defense, sport shooting and beyond
Featuring the innovative Radial Delayed Blowback compact action, the system is optimized for pistol calibers, reducing recoil and enhancing performance
9mm ammunition varies widely from subsonic to supersonic, creating engineering challenges that CMMG addresses with advanced design
The Radial Delayed Blowback compact action tackles these challenges with a fixed ejector built directly into the upper receiver for consistent function
This advanced system also allows for a lighter bolt carrier group (BCG), resulting in reduced felt recoil while maintaining dependable cycling with a wide range of ammunition types
Every CMMG product is covered by our lifetime quality huarantee, a testament to our unwavering commitment to quality and craftsmanship
We stand behind our work, every CMMG product is backed by our lifetime quality huarantee, protecting against defects in materials and workmanship

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Magazines will be removed from firearms when shipping to states with magazine capacity restrictions.

WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).