CMMG RSLT MK4 338 ARC 16.1″ 10RD AB

Description

The CMMG Resolute MK4 in .338 ARC is built for hunters and precision-minded shooters who want meaningfully more energy on target than a .300 Blackout can deliver while staying inside a standard AR-15 frame. That trade-off is the whole point of the .338 ARC cartridge: it mimics the sub- and supersonic flexibility that made 300 BLK popular, but with a heavier projectile and a larger wound channel at hunting distances, and it does so without the gas-system tuning headaches that suppressor use often introduces when switching between load types.

Parts compatibility was a deliberate engineering priority. The .338 ARC shares its bolt with 6.5 Grendel AR-15 rifles, which keeps spare-parts sourcing straightforward for shooters who already run that platform. The 1:8″ twist rate is matched to the heavier projectiles this cartridge is designed around — a faster twist stabilizes longer, denser bullets, so the rifling choice here reflects an expectation that you are running full-weight loads rather than lighter varmint-style projectiles.

The barrel carries a 4140CM nitride finish, which provides corrosion resistance and a hard surface without the added weight of a chrome-lined alternative. The rifle ships with one 10-round CMMG .338 ARC magazine, wears an EML15 handguard, and comes finished in CMMG’s Armor Black. No optic or iron sights are included, so budget for a mount and glass appropriate to your intended range. CMMG backs the rifle with a lifetime quality guarantee against manufacturing defects.

Shipping and availability: It cannot be sold into Illinois. Check your state and local requirements before ordering. This item must ship to a licensed FFL dealer for transfer.