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The .300 Blackout cartridge was built for short barrels, and the Resolute Mk4 takes full advantage of that. CMMG starts with a 14.5" medium-taper barrel in 4140 chrome moly steel with a salt bath nitride finish, then pins and welds their ZEROED SVD brake to bring the total barrel length to 16.1". The result is a trim, quick-handling rifle that points fast in tight spaces but still squeezes solid velocity out of both supersonic and subsonic loads.
Anyone who runs a can knows 300 BLK and suppressors go together like coffee and early mornings, and CMMG clearly built this rifle with that in mind. The adjustable gas block lets you dial the system in for suppressed shooting or tune it to your favorite load, so you get reliable cycling without beating up your brass or your shoulder. Toss in subsonics for quiet range days or step up to supersonic loads when you need more reach, and the rifle takes it all in stride.
The EML 15 handguard gives you M-LOK slots at the 3, 6, 9, and 12 o'clock positions for lights, sights, bipods, and grips, keeping the profile slim where your hand actually lives. CMMG's RipStock delivers six positions of adjustment with a fast, positive lockup, and the ZEROED suite of controls includes an ambidextrous 60/90 degree safety selector along with the grip and other upgraded touches. The whole rifle wears a Coyote Tan Cerakote finish over forged 7075-T6 aluminum receivers, so it looks sharp and shrugs off weather and wear.
At around 6.4 pounds and just under 31 inches overall, the Resolute Mk4 carries easy on a hog hunt, rides comfortably in a truck, and handles home duty without feeling like a pool cue. It ships with a 30-round magazine and is backed by CMMG's lifetime quality guarantee, which says plenty about how they build them. For a do-it-all 300 Blackout rifle in a genuinely compact footprint, this one is tough to beat.
It really is. The .300 Blackout cartridge was designed around subsonic, suppressed use in short barrels, and this rifle comes with an adjustable gas block so you can tune the gas system for a can or for whatever ammo you prefer. The 5/8×24 muzzle device is pinned and welded, so plan on a brake-mounted or over-the-brake suppressor setup rather than swapping the device.
CMMG permanently attaches the ZEROED SVD brake to the 14.5 inch barrel, which brings the total barrel length to 16.1 inches. That gives you a shorter, handier package than a typical 16 inch barrel with a removable device, since the brake counts as part of the overall length. It is one of the most compact ARs you can get in a standard rifle configuration.
This rifle handles the full spread of .300 Blackout, from heavy subsonics in the 190 to 220 grain range to lighter supersonic loads around 110 to 125 grains. Subsonics pair beautifully with a suppressor, while supersonics give you more energy and reach for hunting or general range work. The adjustable gas block makes it easy to keep cycling reliable across both.
Yes. One of the big draws of .300 Blackout is that it runs in standard AR-15 magazines and shares nearly all its parts with a 5.56 rifle, with only the barrel being caliber specific. This one ships with a 30-round magazine, and any quality AR mag you already own will work.
| UPC | 810103479777 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 30A240A-CT |
| Action | |
| Barrel Length | 14.5" |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 30 + 1 |
| Safety | CMMG Zeroed 60/90 Degree |
| Shipping Weight | 8.4 |
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