CMMG 30A240AAB RESOLUTE MK4 .300 Blackout 14.5" AR Rifle

The CMMG 30A240AAB RESOLUTE MK4 .300 Blackout 14.5" AR rifle is purpose-built for operators and tactical professionals who demand subsonic capability paired with genuine combat-proven engineering. Chambered in .300 Blackout, this platform excels in close-quarters combat, breaching operations, and suppressed tactical deployments where traditional 5.56 NATO falls short on ballistic efficiency. The 14.5-inch barrel length strikes a critical balance between velocity retention and maneuverability in confined spaces—a configuration extensively tested by law enforcement and military special operations units.

CMMG's RESOLUTE MK4 design leverages the proven AR platform architecture with refinements specific to subsonic ammunition optimization and suppressed fire. The 14.5-inch barrel delivers consistent velocity with both subsonic and supers0nic loadings, while the .300 Blackout chamber ensures reliable feeding and accuracy across ammunition variations—critical when rounds vary in powder burn rates and velocity windows. At 8.45 pounds, this rifle maintains a field-manageable weight profile without compromising structural rigidity or component durability. The modular AR platform allows for optic mounting, rail integration, and accessory compatibility with standard mil-spec components, ensuring long-term configurability as mission requirements evolve.

Tactical professionals, armored operators, and precision riflemen benefit most from this platform's combination of stopping power and controllability. The RESOLUTE MK4 integrates seamlessly with sound suppressors, night vision systems, and modern fire-control optics—standard requirement for advanced tactical operations. Law enforcement breaching teams and military deployments leveraging suppressed platforms will find this rifle's ergonomics and ballistic characteristics directly applicable to close-quarters combat scenarios. Competent shooters will find the .300 Blackout chambering more forgiving than 5.56 in subsonic applications, delivering measurable terminal performance without supersonic signature compromise. Compatibility with standard AR-15 accessories and ammunition availability through established suppliers ensures operational sustainability and training flexibility in the field.