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CM15 400 Legend 10.5″ Upper with Options

Price range: $839.00 through $1,039.00

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SKU: CM15400105UPP Categories: , ,

CM15 400 Legend 10.5″ Upper

  • CM 6061 lightweight billet aluminum receiver
    • Reliefs featured throughout the receiver
    • Picatinny rail milled channel for a sleek/light weight option
  • CM 6061 9.5″ 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 400 Legend 10.5″ Barrel
    • CrMV
    • Medium Profile
    • Nitride
    • 1:16 Twist
    • Pistol Gas
    • .750 Gas Journal
    • 5/8×24 threaded muzzle

CM15 400 Legend 10.5″ Upper: Hard-Hitting Performance in a Compact Build

The CM15 400 Legend 10.5″ Upper brings Winchester’s straight-walled powerhouse to a compact, maneuverable platform. Designed for hunters and shooters who need massive energy in tight quarters—like thick brush or vehicle-based operations—this upper delivers the high-impact performance of the 400 Legend cartridge without the length of a traditional rifle.

Optimized for Power and Mobility

The 10.5-inch barrel is precision-engineered to handle the heavy projectiles of the .400 caliber, offering a significant ballistic upgrade over the 350 Legend. This “short-barrel” configuration is an ideal choice for a dedicated hunting pistol or SBR, providing enough velocity for effective terminal performance on medium-to-large game while remaining incredibly easy to point and carry.

Tailored to Your Specifications

True to the CM15 mission, this upper features customizable options to suit your specific needs. From M-LOK handguard lengths for mounting lights and bipods to specialized Bolt Carrier Groups (BCGs) designed for straight-wall reliability, you can build this upper to your exact standards.

Key Features:

  • 10.5” Heavy Barrel: Maximizes maneuverability while maintaining structural integrity.

  • 400 Legend Caliber: Superior energy and penetration in a straight-wall cartridge.

  • Universal Compatibility: Pins directly onto any mil-spec AR-15 lower receiver.

The CM15 10.5″ 400 Legend Upper is the perfect solution for those who demand straight-wall authority in a lightweight, rapid-handling package.

Weight 5 lbs
Dimensions 28 × 5 × 5 in
Receiver and Handguard Color

Cobalt Kinetics Green, FDE Metallic, Black Tungsten, Black, FDE, Sniper Grey, OD Green, Burnt Bronze, Other – single color – put in notes at checkout.

Muzzle Device

None – Just a Thread Protector, Silencerco ASR, Dead Air Keymo Flash Hider

Charging Handle and Bolt Carrier Group

Yes, No

B5 Rail Cover

Black, Coyote

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