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. Related