CMMG Resolute MK4 300 Blackout 14.5" Rifle - AR-15 Platform

The CMMG Resolute MK4 300 Blackout delivers proven performance in a compact 14.5-inch barrel configuration. This AR-15 platform rifle maximizes the .300 BLK cartridge's subsonic capabilities while maintaining reliability across all grain weights and powder loads.

What Makes This Different

CMMG's Resolute series features their proprietary RKM KeyMod rail system and enhanced bolt carrier group design. The 14.5-inch barrel length optimizes .300 Blackout ballistics for both supersonic and subsonic ammunition, providing 95% powder burn efficiency compared to shorter barrel alternatives. The rifle ships with CMMG's upgraded trigger group and ambidextrous safety selector.

Key Features

• 14.5-inch 4140 chrome moly barrel with 1:7 twist rate for stabilizing heavy projectiles
• RKM KeyMod handguard with full-length top rail and integrated QD sling points
• Enhanced bolt carrier group with properly headspaced .300 BLK bolt
• Ambidextrous safety selector and enhanced trigger guard
• Standard AR-15 magazine compatibility accepts all .300 BLK magazines
• Matte black anodized finish on upper and lower receivers
• Pre-installed A2 flash hider with standard 5/8x24 threading

Field testing demonstrates consistent 2-3 MOA accuracy with quality ammunition across the .300 BLK spectrum. The barrel length provides optimal velocity retention for hunting applications while remaining compact enough for tactical scenarios. The rifle cycles reliably with both supersonic hunting loads and subsonic ammunition when paired with appropriate suppression systems.

Technical Specs

• Caliber: .300 AAC Blackout
• Barrel Length: 14.5 inches
• Overall Length: 32.25 inches (stock collapsed)
• Weight: 6.8 pounds (unloaded)
• Twist Rate: 1:7 inches
• Handguard: RKM KeyMod, 12-inch length
• Stock: 6-position collapsible carbine stock
• Finish: Type III hard anodized black
• Magazine Capacity: Varies by state regulations
• Made in USA with limited lifetime warranty

CMMG's manufacturing precision and quality control standards ensure consistent performance across their Resolute product line. This configuration represents an optimal balance of portability and ballistic performance for .300 Blackout applications.