Description
CMMG doesn't build bargain-bin ARs, and the Resolute MK4 shows it. This is the Missouri company's take on the do-everything 5.56 carbine, and instead of shipping a bare-bones rifle they load it up with their in-house Zeroed parts from the start. You get a Zeroed trigger, Zeroed pistol grip, an SV muzzle brake on 1/2-28 threads, and ambidextrous controls including the safety selector, magazine catch, and charging handle. Left-handed folks will appreciate not having to swap parts before the first range trip.
What Makes the Resolute MK4 Worth a Look
The 16.1-inch barrel is 4140 chrome moly with a salt bath nitride treatment, spun with a 1:7 twist that stabilizes everything from light varmint loads to heavier 77 grain match ammo. CMMG paired it with a .750 mid-length gas system, which is the setup most experienced AR owners gravitate toward on a 16-inch gun. It runs softer and smoother than carbine-length gas, which means less felt recoil and quicker follow-ups. Up front, the EML15 free-float handguard gives you a full 15 inches of real estate with M-LOK slots at 3, 6, and 9 o'clock plus Picatinny sections top front and rear for lights, bipods, and hand stops.
RipStock, Cerakote, and Real-World Handling
At 6.44 pounds unloaded, this rifle carries easy whether you're working a carbine course or hiking to a shooting spot. The RipStock is CMMG's signature buttstock, designed to snap to your preset length of pull the moment you shoulder the gun. The Cerakote Tungsten finish isn't just for looks either; it adds genuine corrosion and wear resistance over the receivers, and the gray-over-black bi-tone stands out from the sea of plain black rifles at the range.
Setting Up Your CMMG Resolute
The rifle ships without sights, so plan on adding a red dot, LPVO, or backup irons to the flat-top rail. Since it's built on the Mk4 platform, standard AR-15 parts and accessories drop right in. One 30-round magazine comes in the box, and CMMG backs the whole package with their Lifetime Quality Guarantee.
Key Specifications
- Manufacturer: CMMG
- Model: Resolute MK4
- MPN: 55A9D0B-TNG
- UPC: 810144722818
- Caliber: .223 Rem / 5.56 NATO
- Action: Semi-Automatic
- Barrel Length: 16.1 inches
- Barrel Material: 4140 Chrome Moly, Salt Bath Nitride
- Twist Rate: 1:7
- Gas System: .750" Mid-Length
- Muzzle Device: Zeroed SV Muzzle Brake, 1/2-28 Threads
- Handguard: CMMG EML15 15" Free-Float M-LOK
- Stock: CMMG RipStock
- Capacity: 30 Rounds
- Weight: 6.44 lbs (unloaded)
- Finish: Cerakote Tungsten
What’s Included
- CMMG Resolute MK4 rifle
- One 30-round magazine
Frequently Asked Questions
Does the CMMG Resolute MK4 come with sights?
No, this rifle ships without iron sights. The flat-top upper and Picatinny rail sections on the EML15 handguard give you plenty of room to mount a red dot, LPVO, magnified optic, or flip-up backup sights, so you can set it up exactly how you like.
What ammo does the 1:7 twist barrel handle best?
The 1:7 twist is on the faster side, which makes it great for heavier bullets in the 62 to 77 grain range while still shooting common 55 grain ammo just fine. The chamber accepts both 5.56 NATO and .223 Remington, so you can run pretty much any factory load you find on the shelf.
Are the controls on the Resolute MK4 ambidextrous?
Yes. CMMG equips this rifle with their Zeroed ambidextrous safety selector, magazine catch, and charging handle from the factory. That makes it a solid pick for left-handed users or anyone who trains to run the gun from either shoulder without swapping parts.
Will standard AR-15 parts and accessories fit this CMMG rifle?
They will. The Resolute is built on CMMG's Mk4 platform, which follows standard AR-15 dimensions, so grips, stocks, triggers, and other mil-spec pattern components drop right in. The M-LOK handguard also accepts the huge range of M-LOK lights, bipods, and rail sections on the market.





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