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The .338 ARC cartridge was built to do what 300 Blackout does, just with a lot more authority. You get the same easy switch between subsonic and supersonic loads with minimal gas system fuss, but you're pushing heavy .338 caliber bullets instead of .30 caliber ones. That means more weight and more energy on target, especially when running suppressed. CMMG chambered the Dissent MK4 for it, and the pairing makes a lot of sense once you handle one.
The big story here is CMMG's patent-pending Compact Action. The entire recoil system lives inside the upper receiver, so there's no buffer tube hanging off the back. That trims the overall length down to about 18.7 inches and keeps the weight at a very manageable 4.9 pounds. The reversible, non-reciprocating side charging handle is another nice touch, letting lefties and righties run the gun without compromise. Rounding things out are CMMG's Zeroed 60/90 degree safety selector, a Zeroed pistol grip, and a full-length Picatinny top rail for optics.
The 10.5 inch 4140 chrome moly barrel wears a tough nitride finish and a 1:8 twist that stabilizes a wide range of .338 bullet weights, including traditional projectiles if you roll your own ammo. The muzzle is threaded 5/8×24 and topped with CMMG's Zeroed linear compensator, which pushes blast forward and away from you. Ready for a can? Spin the comp off and thread one on. The 9.6 inch free-float M-LOK handguard gives you plenty of real estate for lights, lasers, or a hand stop without adding bulk.
CMMG kept parts compatibility in mind, too. The .338 ARC runs on the same bolt as a 6.5 Grendel AR-15, so you're not stuck hunting for proprietary spares. Add in 7075-T6 aluminum receivers, a durable Armor Black Cerakote finish, and CMMG's lifetime guarantee against defects, and the Dissent MK4 is a hard-hitting, truck-friendly package that earns its keep at the range or in the field.
Correct. CMMG's patent-pending Compact Action houses the entire recoil system inside the upper receiver, so no buffer tube is needed. That's how the Dissent MK4 keeps its overall length down to about 18.7 inches while still cycling like a familiar direct impingement AR.
Yes, and that's really where .338 ARC shines. The barrel is threaded 5/8×24 under the included Zeroed linear compensator, so mounting a can is straightforward. The cartridge was designed to switch between subsonic and supersonic loads with minimal gas system adjustment, and heavy subsonic .338 bullets suppress beautifully.
CMMG designed .338 ARC to use the same bolt as 6.5 Grendel AR-15s, which keeps spare parts easy to source. The 1:8 twist barrel was also chosen to stabilize traditionally constructed .338 caliber projectiles, which is a nice bonus if you handload.
Think of it as 300 Blackout's bigger sibling. It offers the same subsonic and supersonic flexibility, but it pushes heavier .338 caliber bullets, so you get noticeably more energy on target. For suppressed use, hunting, or defense out of a short barrel, that extra payload makes a real difference.
| UPC | 840442506728 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 34A840F-AB |
| Barrel Length | 10.5" |
| Caliber/Gauge | .338 ARC |
| Capacity | 10 + 1 |
| Safety | CMMG Zeroed 60/90 Degree |
| Action | |
| Color | Black |
| Model |
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