CMMG 30BC40AAB Resolute MK4 .300 Blackout 16.1" Rifle

The CMMG 30BC40AAB Resolute MK4 .300 Blackout 16.1" rifle is engineered for operators who demand reliable, compact firepower in specialized roles. Built on the Resolute platform, this .300 Blackout carbine serves law enforcement entry teams, military support units, and civilian shooters seeking a proven subsonic-capable system. The 16.1-inch barrel balances velocity retention with portability, making it ideal for close-quarters scenarios where sound signature and terminal performance matter equally.

The Resolute MK4 features CMMG's refined direct-impingement design tuned specifically for .300 Blackout's expanding case capacity and subsonic load compatibility. The 16.1-inch barrel delivers consistent velocity across both supersonic and suppressed subsonic loads—critical for mission-critical accuracy and reliability in transitional operations. At 3.94 pounds, the rifle maintains a low-recoil profile without sacrificing durability, thanks to CMMG's proven upper and lower receiver integration and quality control standards familiar to professional end-users. The compact 31.3-inch overall length ensures maneuverability in vehicles, buildings, and confined spaces where longer rifles create tactical liability.

This rifle excels for teams running suppressed entries, close-support roles, or dedicated duty within specialized units. The .300 Blackout chambering—paired with CMMG's track record in delivering consistent, tight-tolerance components—supports both barrier-blind ammunition and subsonic match-grade loads. Operators running existing .300 Blackout ammunition stockpiles or transitioning from other platforms will find the Resolute MK4's ergonomics and rail systems compatible with standard tactical accessories. Professional armorers and field users consistently report reliable performance across duty cycles, making this a trusted platform for demanding applications.