Cmmg Resolute MK4 | .300 AAC Blackout | 14.5 in

The CMMG Resolute MK4 assembled upper is an AR-15 compatible partial upper group chambered for .300 AAC Blackout with a 14.5-inch steel barrel. This upper ships without a bolt carrier group or charging handle and features a CMMG EML 13.5-inch M-LOK handguard and a pinned-and-welded SVD-style muzzle brake. The package is intended for builders who need a compact, purpose-built upper for the AR-15 platform.

Product Specifications

• The manufacturer is Cmmg.
• The model is listed as the Resolute MK4 assembled upper.
• The cartridge is .300 AAC Blackout.
• The barrel length is 14.5 inches.
• The barrel material is steel.
• The rate of twist is 1:7.
• The barrel finish is listed as matte black.
• The handguard is a CMMG EML 13.5-inch M-LOK unit.
• The muzzle device is a pinned and welded SVD brake.
• The gas block is a non-adjustable .750 unit.
• Included components are a partial upper group and it includes no bolt carrier group and no charging handle.
• The muzzle thread is 1/2-28.
• The finish is listed as Black Cerakote / armor black.
• This item cannot be shipped directly to California.
• The UPC is 810148622008.

This assembled upper provides a factory-configured, compact option for builders working on short-barrel AR-15 projects or for shooters who use .300 AAC Blackout for close-range and suppressed applications. Its 14.5-inch steel barrel, M-LOK handguard, and pinned/welded muzzle device make it a practical choice when building a dedicated .300 BLK upper for the range or hunting scenarios where that cartridge is appropriate.