The Br4 was purpose-built for Americans navigating restrictive state regulations because everyone deserves a quality firearm, no matter where they live. Enter the Br4 with its all-new EMPIRE profile unthreaded barrel and recessed crown, delivering clean lines and compliance without compromising performance. Designed specifically for states that prohibit threaded barrels, this innovative upper pairs seamlessly with the Br4 lower, which accepts 9mm AR magazines. Measuring 16.1 inches overall, the Br4 ships ready with two 10-round magazines, Remington 870 stock compatibility, a cross-bolt safety, forward non-reciprocating side charger and CMMG's proprietary ZEROED single-stage trigger. Offers in seven custom Cerakote finishes, the Br4 proves that even compliant rifles can have serious style and performance. 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 offers a wide range of loadings, from fast supersonic rounds to slower subsonic options, making it one of the most versatile calibers on the market This wide variety of bullet weights and velocities presents new engineering challenges when developing reliable, high-performance platforms 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