The CMMG Resolute Mk4 5.56 NATO rifle (brand part no. 55AC780-AB) is a carbine-length AR-15 built for shooters who want a dependable general-purpose rifle. CMMG builds the Resolute on the Mk4 platform, so it accepts virtually any AR-15 accessory. It is chambered in 5.56x45mm NATO, a cartridge with wide ammunition availability. The EML 15 handguard has M-LOK attachment slots at the 3, 6, 9 and 12 o’clock positions for lights, grips and bipods. It works equally well as a first AR, a range rifle or a home-defense carbine.

Key Specifications

• The chambering is 5.56x45mm NATO, a cartridge with wide ammunition availability for practice and defense.
• Barrel length is 16.1 inches, a carbine length that stays handy while keeping good velocity.
• Capacity is 30 rounds in a standard AR-15 magazine, which also means plentiful aftermarket magazines.
• The handguard is the EML 15 with M-LOK slots at the 3, 6, 9 and 12 o’clock positions for mounting accessories.
• The rifle is built on the Mk4 AR-15 platform, so it accepts virtually any AR-15 accessory.

Frequently Asked Questions

What caliber is the Resolute Mk4 in this listing? This listing is the 5.56x45mm NATO version with a 16.1-inch barrel.

Where can I mount accessories? The EML 15 handguard has M-LOK slots at the 3, 6, 9 and 12 o’clock positions.

Will AR-15 accessories fit? Yes. CMMG builds it on the Mk4 platform, which accepts virtually any AR-15 accessory.

Buy the CMMG Resolute Mk4 5.56 NATO Rifle, 16.1-Inch Barrel, Black, 30-Round

The Resolute Mk4 is a straightforward AR-15 carbine that takes the accessories you already own. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and see more AR rifles.