The CMMG Resolute Mk4 6mm ARC rifle in Midnight Bronze (CMMG part no. 60AF30C-MB) delivers long-range ballistics from a lightweight AR-15 carbine. CMMG says the 6mm ARC, introduced in 2020, was designed to rival the extended-range performance of cartridges usually found in larger AR-10 rifles. A 16.1-inch 416 stainless barrel with a 1:7.5 twist works with the ZEROED SVB brake, adjustable gas block and EML15 M-LOK handguard. It suits hunters and extended-range target shooters who want a flat-shooting rifle with a modern, carbine-length layout.

Key Specifications

• The chambering is 6mm ARC, the Advanced Rifle Cartridge introduced in 2020 for flat-shooting AR-15 rifles.
• The barrel is 16.1 inches and made of 416 stainless steel with a salt-bath nitride finish.
• Rifling is a 1:7.5 twist, which suits the heavier 6mm bullets used at distance.
• The muzzle carries a ZEROED SVB brake on a 5/8×24 thread, so other 5/8×24 muzzle devices fit.
• The gas block is adjustable at 0.750 inch, giving you a way to tune cycling.
• Feeding is from a 10-round CMMG magazine that ships with the rifle.
• The stock is the CMMG RipStock on a six-position fastback receiver extension for adjustable length of pull.
• The handguard is the EML15 M-LOK with slots at 3, 6, 9 and 12 o’clock for lights and grips.
• The safety is a ZEROED 60/90-degree ambidextrous selector, with a ZEROED drop-in trigger.
• The finish is Midnight Bronze Cerakote, over a billet 6061-T6 upper and forged 7075-T6 lower.

Frequently Asked Questions

Is the 6mm ARC a good hunting cartridge? CMMG says it makes a great choice for hunters and extended-range target shooters who want predictable, flat-shooting performance from a carbine-length rifle.

Is the barrel stainless? Yes. The barrel is 416 stainless steel with a salt-bath nitride finish, per CMMG.

What color is this version? This version is Midnight Bronze Cerakote; the same Resolute Mk4 6mm ARC is also sold in other colors.

Buy the CMMG Resolute Mk4 Rifle, 6mm ARC, 16.1-Inch, Midnight Bronze, Muzzle Brake, 10-Round

Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and compare it with other AR rifles in the store. This Midnight Bronze 6mm ARC suits shooters who want long-range flatness in a carbine.