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The .338 ARC cartridge was built to answer a simple question: what if you could get 300 Blackout style versatility out of an AR15 but hit noticeably harder on the other end? CMMG's Resolute MK4 is the carbine that puts that idea to work. It swaps between supersonic and subsonic ammo without the constant gas system fiddling that usually comes with running a can, so you can screw a suppressor onto the threaded 16.1 inch barrel, load up heavy subs, and get back to shooting instead of tuning.
The barrel wears a durable black nitride finish and a 1:8 twist, which is on the slower side for a reason. That twist rate lets handloaders run traditional cup and core .338 projectiles instead of being locked into specialty bullets. A linear compensator up front pushes blast and concussion forward, which your buddies on the next bench will appreciate. Another smart touch is bolt compatibility: .338 ARC uses the same bolt as 6.5 Grendel AR15s, so spare parts are easy to come by and the whole platform stays familiar to anyone who has spent time behind an AR.
CMMG dressed this one in Tungsten Cerakote over the aluminum receiver set, and it pairs nicely with the tungsten polymer RipStock, which snaps to your preferred length of pull fast when you shoulder the rifle. The EML15 handguard keeps things slim with M-LOK slots at 3, 6, and 9 o'clock, and the flat top Picatinny rail is ready for whatever optic suits the job. The Zeroed pistol grip and ambidextrous friendly 60/90 degree safety round out a control setup that feels dialed right out of the box.
At 6.2 pounds and 37.3 inches overall, this is a legitimately packable rifle for hog country, dense timber deer hunting, or a suppressed range day where you want more thump than a Blackout delivers. It feeds from a 10 round magazine and arrives with no sights, so plan on adding glass or a dot.
Yes, and that flexibility is the whole point of the .338 ARC cartridge. It was designed to cycle both supersonic and subsonic loads reliably with far less gas system tuning than most calibers need when you switch between suppressed and unsuppressed shooting. That makes it a great match for suppressor owners who like to mix load types.
The 16.1 inch barrel is threaded and comes topped with a linear compensator from the factory. Remove the comp and you can mount a direct thread suppressor or your preferred muzzle-mounted adapter. The cartridge itself pairs exceptionally well with a can, especially with heavy subsonic loads.
No, it ships without sights. The flat top Picatinny receiver rail gives you plenty of room for a scope, red dot, or LPVO, and the EML15 handguard has M-LOK slots for lights, bipods, and other accessories. Most buyers pair it with a low power variable optic for hunting or general use.
The .338 ARC shares its bolt with 6.5 Grendel AR15s, which keeps parts easy to source. Beyond the bolt and barrel, the rifle is built on the standard AR15 platform, so most furniture, triggers, and small parts you already own will interchange. That commonality is one of the caliber's biggest practical advantages.
| UPC | 840442507275 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 34A120FTNG |
| Barrel Length | 16.1" |
| Caliber/Gauge | .338 ARC |
| Capacity | 10 + 1 |
| Safety | CMMG Zeroed 60/90 Degree |
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