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The .338 ARC cartridge was built to do what the 300 Blackout does, just with more authority. It runs subsonic or supersonic and delivers noticeably more energy downrange, and it does it with minimal gas system fiddling when you go from suppressed to unsuppressed. CMMG chambered the Resolute MK4 for exactly that kind of shooting, pairing a 16.1 inch threaded barrel with a standard AR15 sized platform so you get big bore performance without stepping up to a heavier large-frame rifle. The whole package comes in at a trim 6.2 pounds with a 39.55 inch overall length.
Parts compatibility is a big deal here. The .338 ARC uses the same bolt as 6.5 Grendel AR15s, so spares are easy to source and the rest of the rifle keeps standard AR15 commonality where it counts. Handloaders will appreciate the 1:8 twist rate, which is slower than most .338 barrels on purpose. It opens the door to a wide range of traditional .338 caliber bullets instead of locking you into a narrow selection.
CMMG didn't ship this one bare bones. It wears the company's American-made Zeroed furniture and controls, including a single stage Zeroed trigger, plus the RipStock, an adjustable buttstock that snaps to your preferred length of pull the moment you shoulder it. The EML 15 handguard keeps things slim with M-LOK slots at the 3, 6, and 9 o'clock positions and a trimmed top section that sheds bulk where you don't need rail. The Armor Black Cerakote finish over aluminum receivers rounds it out.
No sights come mounted, so plan on adding your favorite optic. Whether you're hunting hogs and deer inside 300 yards, running a suppressor, or just want an AR that hits harder than the usual suspects, this one earns its spot in the safe.
The .338 ARC is a large bore AR15 cartridge designed to run both subsonic and supersonic loads, much like 300 Blackout, but it delivers more energy on target. It also needs less gas system tuning when switching between suppressed and unsuppressed shooting. If you like what the Blackout does but want a bigger payload, this is the natural next step.
For the most part, yes. It's built on CMMG's Mk4 platform, which is AR15 sized, and the .338 ARC uses the same bolt as 6.5 Grendel rifles to keep parts easy to find. Furniture, triggers, and most small parts follow standard AR15 patterns.
No, this rifle ships without sights. The upper receiver is set up for optics, so plan to mount a red dot, LPVO, or magnified scope depending on how you intend to use it. Most buyers running .338 ARC for hunting pair it with a low to mid power variable.
Yes, the 16.1 inch barrel comes threaded, so you can run a suppressor, brake, or flash hider. The .338 ARC cartridge was designed with suppressed shooting in mind, and subsonic loads through a can are one of the main reasons people buy this rifle.
| UPC | 840442507213 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 34A120F-AB |
| Action | |
| ATF Type | MODERN SPORTING RIFLE |
| Barrel Length | 16.1" |
| Caliber/Gauge | .338 ARC |
| Capacity | 10 + 1 |
| Color | Black |
| Length | 39.5500 |
| Model | |
| Sights | No |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
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