CM15 12.7x42mm 16″ Upper with Options

16” upper | CM15 12.7x42mm 16″ Upper with Options

CM15 12.7x42mm 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
• Tank Brake
• 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 12.7x42mm 16″ Barrel
  • CrMV
  • HBAR Profile
  • Black Cerakote
  • 1:20 Twist
  • Carbine Gas
  • .936 Gas Journal
  • 49/64×20 threaded muzzle

CM15 12.7x42mm 16″ Upper: The Ultimate Big-Bore Workhorse

Experience the full ballistic potential of the 12.7x42mm cartridge with the CM15 16″ Upper. While shorter barrels offer portability, this 16-inch version is designed for shooters who want to maximize velocity, improve long-range stability, and ensure their build meets standard rifle length requirements without the need for additional NFA paperwork.

Maximized Ballistics & Precision

The 16-inch barrel allows for a more complete powder burn, translating into higher muzzle velocities and flatter trajectories compared to shorter variants. This makes it the premier choice for hunters pursuing large game or enthusiasts looking to ring steel at extended distances. Built from high-grade 4150 Chrome Moly Vanadium steel, the barrel is engineered to withstand the intense pressures of big-bore cycling while maintaining consistent accuracy.

Fully Tailored to Your Needs

True to the CM15 line, this upper comes with flexible options to suit your style. Choose from various M-LOK handguard lengths, high-performance Bolt Carrier Groups, and specialized muzzle brakes designed to significantly mitigate the 12.7x42mm’s signature recoil.

Main Features:

• 16″ Heavy Barrel: Superior dwell time and increased velocity.

• Big-Bore Ejection Port: Enlarged for reliable cycling of .50 caliber brass.

• Universal Fit: Seamlessly pins to any standard AR-15 lower.

The CM15 16″ Upper is the perfect blend of authority and reliability, turning your standard platform into a heavy-hitting powerhouse.