CM15 338 ARC 16″ Upper with Options

CM15 338 ARC 16″ Upper

• CM 6061 lightweight billet aluminum receiver
  • Reliefs featured throughout the receiver
  • Picatinny rail milled channel for a sleek/light weight option
• CM 6061 15″ MLOK handguard
  • QD Sockets at 3 and 9 o’clock
  • Full Picatinny top rail
• Choice of Suppressor Host Muzzle Device or Thread Protector
• CM15 Low Mass Bolt Carrier Group
  • 9310 Hardened Steel Bolt
  • 17-4 Stainless Steel Firing Pin
  • 8620 Carrier and Key
  • MPI Tested
  • Hardened Extractor S7 Steel
• CM15 Warhammer Ambidextrous Charging Handle – in collaboration with Breek Arms
• Superlative Arms Adjustable Gas Block
• CM Melonite Gas Tube
• CM15 338 ARC 16″ Barrel
  • CrMV
  • DRP Profile
  • Nitride
  • 1:8 Twist
  • Pistol Gas
  • .875 Gas Journal
  • 5/8×24 threaded muzzle

CM15 338 ARC 16″ Upper: Long-Range Authority, AR-15 Portability

The CM15 338 ARC 16″ Upper brings the sheer power of .338 caliber ballistics to the versatile AR-15 platform without the need for NFA paperwork. Designed for the 338 Advanced Rifle Cartridge, this 16-inch configuration is the definitive choice for hunters and marksmen who demand the maximum velocity and energy that this groundbreaking cartridge can provide.

Maximized Ballistic Reach

While shorter barrels excel in CQB, the 16-inch barrel is engineered to fully utilize the powder capacity of the 338 ARC. This results in higher muzzle velocities for supersonic loads, offering a flatter trajectory and greater kinetic energy at extended ranges. Whether you are tracking large game or engaging targets at distance, the 1:5 twist rate ensures that even the heaviest high-BC projectiles remain perfectly stabilized for match-grade accuracy.

Premium Customization

Every CM15 upper is a foundation for excellence. With our customizable options, you can select the perfect M-LOK handguard for your optics setup, choose a specialized bolt carrier group for maximum reliability, and add a muzzle brake to tame the “thump” of this heavy-hitting round.

Core Features:

• 16″ Match-Grade Barrel: Optimized for maximum velocity and reach.

• 1:5 Twist Rate: Expertly stabilizes heavy .338 caliber bullets.

• Reliable Integration: Fits standard AR-15 lowers using 6.5 Grendel-pattern magazines.

The CM15 16″ 338 ARC Upper is the ultimate big-bore workhorse for the modern shooter.