CMMG RESOLUTE MK4 5.7x28mm

The CMMG RESOLUTE Mk4 chambered in 5.7x28mm is a modular carbine-length rifle designed for precision on the range, practical personal defense applications, and competitive shooting where lightweight handling and magazine compatibility matter. Its AR-style magwell accepts CMMG’s dedicated 5.7 magazines to preserve modularity across platforms.

Built on CMMG’s Mk4 platform, the RESOLUTE Mk4 blends billet and forged receiver construction with ambidextrous controls and a RipStock for ergonomic adjustment. The CMMG EML15 M-LOK handguard reduces weight while providing standard attachment points at 3, 6, 9 and 12 o’clock for accessories.

Key Specifications

• The platform is Mk4.
• The caliber is 5.7x28mm.
• The action type is Semi-Automatic.
• The operating system is Radial Delayed Blowback.
• The barrel length is 16.1 inches.
• The barrel twist is 1:9.
• The barrel material is 4140CM SBN.
• The muzzle thread is 1/2 x 28.
• The handguard is a CMMG EML15 M-LOK.
• The weight is approximately 6.44 lbs.

With billet and forged receiver components, ambidextrous ZEROED controls, and a purpose-built handguard, the CMMG RESOLUTE MK4 delivers a refined 5.7x28mm platform for shooters seeking modular AR compatibility. Buy the CMMG RESOLUTE MK4 5.7x28mm online today to add a versatile, precision-oriented rifle to your collection.