CM15 6MM ARC 16″ Upper with Options

CM15 6MM 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 6MM ARC Fluted 16″ Barrel
  • 416R Stainless Steel
  • SPR Profile
  • Black Cerakote
  • Straight Fluted
  • 1:7 Twist
  • Midlength Gas
  • .750 Gas Journal
  • 5/8×24 threaded muzzle

CM15 6mm ARC 16″ Upper: The Ultimate Long-Range Advantage

The CM15 6mm ARC 16″ Upper is designed for those who want to push the AR-15 platform to its absolute ballistic limit. Engineered by Hornady for the most demanding tactical and competitive environments, the 6mm Advanced Rifle Cartridge (ARC) provides a flat trajectory and superior wind-bucking capabilities that rival much larger cartridges—all while maintaining the lightweight ergonomics of a standard carbine.

Precision at Distance

The 16-inch barrel length is the “sweet spot” for the 6mm ARC, offering enough velocity to engage targets at 1,000 yards while remaining short enough for easy movement through brush or on the range. The 1:7 twist rate is specifically selected to stabilize high-BC, heavy-for-caliber projectiles, ensuring match-grade consistency. Whether you are a precision shooter, a coyote hunter, or a long-range enthusiast, this upper delivers the reach and energy you need.

Built for Reliability

Every CM15 upper is crafted with attention to detail. Our 6mm ARC models feature specialized bolt carrier groups and gas systems tuned to the cartridge’s unique pressure curve. With our customizable options, you can select the perfect M-LOK handguard for your optics and bipod, ensuring a rock-solid foundation for your precision build.

Core Highlights:

• 16” Match-Grade Barrel: 4150 CMV steel optimized for long-range consistency.

• Caliber: 6mm ARC (Advanced Rifle Cartridge).

• Extended Reach: Flat trajectory and high energy retention at extreme ranges.

• Versatile Options: Customize your rail, BCG, and charging handle to fit your style.

The CM15 16″ 6mm ARC Upper is the definitive choice for the shooter who demands maximum precision without the weight of a large-frame rifle.