CMMG starts every project with one of the most popular calibers in mind, 5.56x45mm and the Br4 is no exception. Designed specifically for Americans living in restrictive states, the Br4 now features the all-new EMPIRE profile unthreaded barrel with a recessed crown. This smart upgrade delivers compliance without compromising performance. Like every Br4, this model is built to work seamlessly with 5.56x45mm AR magazines and ships with two 10-round Magpul PMAGs. It is also equipped with a Remington 870 stock compatible rear, cross-bolt safety, forward non-reciprocating side charger and a proprietary Zeroed single-stage trigger, all wrapped up in your choice of seven Cerakote finishes.

The adjustable gas block allows you to fine-tune your rifle's gas system for optimal performance across different ammunition types and shooting conditions
For suppressed shooting or precision tuning, the adjustable gas block lets you dial-in just the right amount of gas, never too much, never too little
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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Shipping Restrictions

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).