The CMMG Resolute MK4 Complete Upper Group, 5.56, 16.1in, Black (brand part no. 55BC7C3AB) is a complete, ready-to-run AR-15 upper chambered in 5.56 NATO with a 16.1-inch barrel, finished in black, from CMMG’s Resolute MK4 line.

Key Specifications

• Chambered in 5.56 NATO
• Barrel length of 16.1 inches, clearing the federal rifle minimum
• Part of CMMG’s Resolute MK4 line of complete uppers
• Finished in black
• Sold as a complete and ready to install upper group

Frequently Asked Questions

Is this a complete upper? Yes, it is a complete, ready-to-install upper group.

Does this barrel length clear the federal minimum? Yes, at 16.1 inches it clears the 16-inch federal rifle minimum with no NFA concern.

Buy the CMMG Resolute MK4 Complete Upper Group, 5.56, 16.1in, Black

Order the CMMG Resolute MK4 Complete Upper Group, 5.56, 16.1in, Black from our catalog, or browse more AR15 uppers at Schaefer Defense. Ships fast from our Lubbock, Texas gun shop.