CMMG Resolute Mk4 338 ARC Upper Assembly 16.1in Black Nitride Barrel, Black Armor 34B440FAB

SKU: FLX-182970

Vendor CMMG
Regular price $862.98
Sale price $862.98 Regular price $959.66
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Product Description

The CMMG Resolute Mk4 in 338 ARC is built to blend AR-15 platform handling with large bore performance, delivering strong energy on target in both suppressed and unsuppressed setups with reduced gas system tuning compared to similar cartridges. This upper assembly features a 16.1 inch black nitride barrel with a 1:8 twist optimized for traditional .338 caliber projectiles, plus a Black Armor Cerakote finished aluminum receiver for durability and corrosion resistance. To maximize parts compatibility, the 338 ARC design uses the same bolt as 6.5 Grendel AR-15 systems, making it a smart option for shooters who want versatility without overcomplicating their build.

Product Highlights

  • 338 ARC upper designed for AR-15 style platforms, balancing power with versatile suppressed and unsuppressed performance
  • 16.1 inch black nitride barrel with 1:8 twist to stabilize a wide range of .338 caliber projectiles
  • Carbine length gas system for reliable cycling and common parts compatibility
  • 5/8x24 threaded muzzle with CMMG Zeroed Muzzle Brake included
  • 15 inch M-LOK handguard (EML 15) provides lightweight rigidity and ample mounting space

Specs

  • Brand: CMMG
  • Manufacturer Part Number: 34B440FAB
  • UPC: 840442506483
  • Platform Compatibility: AR-15 / AR style
  • Caliber: 338 ARC
  • Barrel Length: 16.1 in (16.10 in)
  • Barrel Finish: Black Nitride
  • Twist Rate: 1:8
  • Gas System Length: Carbine Length
  • Muzzle Threads: 5/8x24
  • Muzzle Device: CMMG Zeroed Muzzle Brake
  • Receiver Material: Aluminum
  • Receiver Finish: Black Armor Cerakote
  • Handguard: EML 15, M-LOK
  • Handguard Length: 15 in
  • Overall Length: 25.5 in
  • Weight: 4.10 lbs

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