CMMG Dissent BR4 6mm ARC 16.1" - CA Compliant - AR-15 Rifle - 2x 10rd Mags

The CMMG Dissent BR4 is a California-compliant semi-auto rifle chambered in 6mm ARC with a 16.1" barrel and cross-bolt safety—giving California-based shooters access to the Hornady cartridge's long-range ballistic performance in a factory-configured compliant platform.

The 16.1" 4140CM SBN barrel with 1:7.5" twist delivers 6mm ARC's characteristic long-range accuracy and wind-resistance advantage from a standard rifle-length platform. The CMMG Zeroed Muzzle Brake manages the cartridge's recoil impulse for precise follow-up shots, and the Zeroed Drop-In Single Stage trigger provides factory-tuned pull consistency. The 7075-T6 aluminum receiver is finished in Black Armor Cerakote, and the Magpul SGA stock allows adjustable fit for different shooter builds.

Cross-bolt safety satisfies CA featureless requirements at the full 16.1" barrel length. Compatible with 6mm ARC magazines up to 10-round CA-compliant capacity. Ships with two 10-round magazines. Thread pattern is 5/8"x24—note when selecting muzzle devices, as this differs from the standard AR-15 1/2"x28 pattern.

The 7075-T6 aluminum receiver, 4140CM SBN barrel, and Magpul SGA stock are all finished in Black, creating a uniform all-black appearance at 38.1" OAL and 8.0 lbs.

A meaningful option for California shooters who want 6mm ARC's long-range capability in a fully factory-compliant configuration—a combination that isn't widely available from production manufacturers.

CMMG's decision to offer the Dissent BR4 in 6mm ARC reflects their commitment to serving compliant-state markets with precision caliber options beyond standard 5.56 configurations.