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The .300 Blackout cartridge earned its reputation running quiet through suppressed short barrels, but it has grown into a genuinely versatile .30 caliber option, and the CMMG Resolute MK4 gives it a proper carbine-length home. The 16.1-inch medium taper barrel is machined from 4140CM chrome moly steel with a black nitride finish, spun with a 1:7 twist that stabilizes everything from light supersonic loads to heavy 220 grain subsonics. The muzzle wears standard 5/8×24 threads behind CMMG's ZEROED muzzle brake, so swapping to your suppressor takes about a minute.
CMMG builds the MK4 on a billet 6061-T6 upper mated to a forged 7075-T6 lower, then loads it up with their ZEROED parts line made in the USA. That means a drop-in single stage trigger, 60/90 degree ambidextrous safety, ambi charging handle, ambi mag catch with an extended release button, and a polymer dust cover all come standard. These are the upgrades most folks end up buying separately for a factory AR, and here they're already installed. The 15-inch EML handguard runs full-length M-LOK slots on the sides and bottom plus additional slots between the top Picatinny sections, giving you plenty of real estate for lights, lasers, and hand stops without unnecessary weight.
With the six-position RipStock collapsed, this carbine stays compact and quick to shoulder, and the direct impingement gas system with a carbine-length .750 gas block keeps things running the way an AR should. The coyote tan Cerakote finish looks sharp and holds up to honest field use. Suppressed with subsonics for hogs at night, loaded supersonic for whitetail inside 200 yards, or set up as a soft-shooting home defense rig, this platform handles all of it without complaint.
Every CMMG firearm carries the company's Lifetime Quality Guarantee against defects in materials and workmanship. A Magpul 30-round PMAG ships in the box, so all you need is glass and ammo to get started.
Yes. The 16.1-inch barrel is threaded 5/8×24, which is the standard pattern for .30 caliber suppressors and muzzle devices. It ships with CMMG's ZEROED muzzle brake installed, so you just spin that off and thread on your can. The 1:7 twist also stabilizes heavy subsonic loads, which is where a suppressed .300 BLK really shines.
No, it ships without sights. The full-length Picatinny top rail runs across the receiver and handguard, so mounting a red dot, LPVO, or backup irons is simple. Most buyers pair it with a red dot or low-power variable given the practical range of .300 Blackout.
It's built for both. The 1:7 twist barrel handles light supersonic loads in the 110 to 125 grain range as well as heavy 190 to 220 grain subsonics. As with most .300 BLK carbines, subsonic ammo cycles most reliably when shooting suppressed, while supersonic loads run great with or without a can.
ZEROED is CMMG's in-house line of American-made upgrade parts, and the Resolute comes loaded with them from the factory. That includes the drop-in single stage trigger, 60/90 degree ambidextrous safety, ambi charging handle, ambi mag catch with extended release button, pistol grip, muzzle brake, bolt catch, and polymer dust cover. It saves you from piecing together upgrades after the purchase.
| UPC | 810144724058 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 30AE70ACT |
| Action | |
| Barrel Length | 16.1" |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 30 + 1 |
| Safety | CMMG Zeroed 60/90 Degree |
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