CMMG RESOLUTE MK4 .300 Blackout 14.5" Coyote Tan Finish Rifle

The CMMG 30A240ACT Resolute MK4 300 Blackout 14.5-inch rifle is purpose-built for suppressed and subsonic operation. Chambered in .300 BLK, this platform combines the proven AR15/M4 ecosystem with a cartridge originally engineered for short-barrel, sound-suppressed rifles. The Resolute MK4 delivers effective .30-caliber performance in configurations optimized for home defense, CQB training, and tactical applications where velocity management and suppression efficiency matter.

Built on the battle-proven Mk4 AR platform, this rifle features CMMG's EML handguard with full-length M-LOK slots on both sides and the bottom, plus additional M-LOK real estate between the top Picatinny rail. This configuration supports a wide range of tactical accessories—weapon lights, vertical grips, rail-mounted systems—without requiring adapters. The 14.5-inch barrel enables fast target transition in confined spaces while maintaining enough dwell time for reliable operation with both subsonic and supersonic .300 BLK loads. Weight of 8.6 lbs keeps the platform maneuverable during extended duty cycles.

This configuration suits operators conducting precision work in low-signature environments, home defenders preparing for close-quarters response, and shooters training on .300 BLK subsonic ballistics without the cost or complexity of proprietary systems. Because .300 Blackout shares lower/receiver commonality and magazine compatibility with standard AR15 platforms, ammunition sourcing and parts support align with the broader tactical rifle ecosystem. The Resolute MK4 represents an accessible entry point into dedicated short-barrel rifle performance for those prioritizing suppression capability and carbine-length ergonomics.