The CMMG Resolute MK4 partial upper group (CMMG part no. 30BD30A-AB) ships with a 14.5-inch 300 AAC Blackout barrel, M-LOK handguard, and pinned-and-welded muzzle device, ready for the builder to add a bolt carrier group and charging handle.

Key Specifications

• Brand: CMMG.
• Caliber: 300 AAC Blackout.
• Barrel length: 14.5 inches.
• Barrel material/finish: steel, matte black.
• Rate of twist: 1:7 inches.
• Handguard: CMMG EML 13.5 M-LOK.
• Muzzle device: SVD brake, pinned and welded.
• Gas block: non-adjustable, .750 inch.
• Included: no bolt carrier group, no charging handle (partial upper group).

Frequently Asked Questions

Does this include a bolt carrier group? No, this is a partial upper group — the BCG and charging handle are not included and must be sourced separately.

Why is the muzzle device pinned and welded? It brings the 14.5-inch barrel to a 16-inch-plus overall barrel length.

Buy the CMMG Resolute MK4 Upper Group, 300 AAC Blackout, 14.5in

Get the CMMG Resolute MK4 Upper Group, 300 AAC Blackout, 14.5in from CMMG, browsable in our full AR15 Uppers selection. Our Lubbock, Texas team ships fast, insured orders every day.