CM15 300BLK 5″ 1:5 Twist Upper with Options

300 BLK Upper | 5″ 1:5 Twist Upper with Options

CM15 300 BLK Upper

• CM 6061 lightweight billet aluminum receiver
  • Reliefs featured throughout the receiver
  • Picatinny rail milled channel for a sleek/light weight option
• CM 6061 4″ 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 300 BLK 5″ Barrel
  • CrMV
  • Medium Profile
  • Nitrided
  • 1:5 Twist
  • Micro Gas
  • .750 Gas Journal
  • 5/8×24 threaded muzzle

CM15 300 BLK Upper: The Apex of Compact Power

When size is the primary constraint but performance is non-negotiable, the CM15 300BLK 5″ Upper stands alone. Engineered for ultra-discreet builds and maximum maneuverability, this “micro” upper delivers hard-hitting .30 caliber authority in a package small enough for backpack carry or vehicle deployment.

1:5 Twist: Stability in a Short Format

The standout feature of this build is the 1:5 ultra-fast twist rate. In such a short barrel, a standard twist often fails to stabilize heavy subsonic projectiles. Our 1:5 rifling ensures that even the heaviest 220gr+ bullets achieve maximum rotational stability the moment they leave the muzzle, providing pinpoint accuracy and reliable expansion where other micro-barrels fail.

Optimized for the Stealth Professional

Designed specifically to be the ultimate suppressor host, the 5-inch barrel length keeps your overall footprint minimal even with a “can” attached. The specialized gas port is tuned to ensure reliable cycling in the most compact configurations.

Core Specs:

• 5” 4150 CMV Barrel: Maximum portability without sacrificing structural integrity.

• 1:5 Twist Rate: Specifically tuned for heavy subsonic stabilization.

• Customizable Options: Choose your preferred handguard, BCG, and charging handle to finish your PDW build.

The CM15 5″ Upper is the definitive choice for a Personal Defense Weapon (PDW) that prioritizes stealth, speed, and stopping power.