The CMMG Resolute Mk4 in .300 AAC Blackout (CMMG part no. 30A240A-CT) is a carbine-length AR-15 rifle with a 14.5-inch barrel and a ZEROED SVD brake pinned and welded to the muzzle. The pinned brake brings the overall barrel length to 16.1 inches, which keeps it a compact rifle with no pistol tube or SBR conversion. It uses CMMG’s EML15 M-LOK handguard, a RipStock and a 30-round magazine. It is for shooters who want a compact .300 BLK for supersonic and subsonic loads.

Key Specifications

• The chambering is .300 AAC Blackout, a .30 caliber cartridge that works with supersonic and subsonic loads.
• The barrel is 14.5 inches with a 1:7 twist, made of 4140CM steel.
• The muzzle device is a ZEROED SVD brake pinned and welded, bringing the overall barrel length to 16.1 inches.
• The magazine is a 30-round magazine.
• The operating system is direct impingement, the proven AR-15 gas system.
• The handguard is a CMMG EML15 M-LOK design for mounting accessories.
• The stock is the CMMG RipStock, a 6-position carbine stock.
• The gas block is adjustable 0.750-inch, for tuning the rifle to suppressed or unsuppressed use.
• The safety is a ZEROED 60/90 degree selector, and the trigger is a ZEROED drop-in unit.
• The finish is Coyote Tan Cerakote on a Mk4 platform.

Frequently Asked Questions

Is the barrel 14.5 or 16.1 inches? The barrel is 14.5 inches, and the ZEROED SVD brake is pinned and welded to the muzzle, bringing the overall barrel length to 16.1 inches.

Can it run subsonic ammunition? Yes. CMMG notes that .300 BLK offers a wide range of super and subsonic loads.

What magazine does it use? It uses a 30-round magazine.

Buy the CMMG Resolute Mk4 Rifle, .300 AAC Blackout, 14.5-Inch, Coyote Tan, 30-Round

CMMG builds its ZEROED rifles for shooters who want a complete, ready-to-run setup. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and see more rifles in our AR rifles.