CMMG 30AE70ACT RESOLUTE MK4 300BO 16.1 COY

The CMMG 30AE70ACT RESOLUTE MK4 300 Blackout 16.1-inch rifle combines modern AR15 platform reliability with the subsonic ballistics of .300 BLK—the intermediate cartridge purpose-built for suppressed, short-barreled applications. Weighing 7.8 lbs and measuring 39.5 inches overall, this rifle delivers heavy .30-caliber energy downrange while maintaining a compact footprint ideal for confined spaces, tactical operations, and precision shooting environments where hearing protection and signature reduction matter.

Built on the proven MK4 AR15 platform, the RESOLUTE features an extended M-LOK handguard with full-length accessory slots on both sides and bottom surface, plus M-LOK integration between the top Picatinny rail. This modular design allows operators to mount lights, lasers, foregrips, and other mission-specific components without proprietary adapters. The 16.1-inch barrel provides optimal velocity for both subsonic .300 BLK loadings (150–220 grain) and supersonic hunting rounds, leveraging the cartridge's original design goal of maximizing M4/AR15 parts commonality and ammunition component compatibility.

Law enforcement tactical teams, military operators, and civilian home-defense shooters favor .300 BLK in suppressed configurations where subsonic performance prevents sonic crack and manages noise signature in populated areas. The compact 16.1-inch length and 7.8-pound total weight reduce fatigue during extended operations and improve handling in vehicles, hallways, and close-quarters scenarios. Serious shooters who already own AR15 magazines and maintenance tools can deploy this platform immediately with minimal logistics burden, making the CMMG RESOLUTE MK4 300 Blackout an efficient addition to existing arsenals.