CM15 338 ARC 8.5″ Upper CM 6061 lightweight billet aluminum receiver Reliefs featured throughout the receiver Picatinny rail milled channel for a sleek/light weight option CM 6061 7.25″ 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 338 ARC 8.5″ Barrel 416R Stainless Steel Medium Profile QPQ Corrosion Resistant 1:5 Twist Pistol Gas .750 Gas Journal 5/8×24 threaded muzzle CM15 338 ARC 8.5″ Upper: The Ultimate Compact Thumper The CM15 338 ARC 8.5″ Upper is the pinnacle of Personal Defense Weapon (PDW) engineering. By chambering the revolutionary 338 Advanced Rifle Cartridge in an 8.5-inch barrel, we’ve created a system that delivers massive frontal diameter and heavy-hitting energy in a package that is exceptionally easy to stow and maneuver. Optimized 1:5 Twist Stability To master the heavy, high-BC projectiles that make the 338 ARC famous, rotation is key. Our ultra-fast 1:5 twist rate is purpose-built to stabilize heavy subsonic rounds in a short bore. This ensures your projectiles maintain a true flight path and deliver maximum terminal energy upon impact, eliminating the stability issues common in slower-twist short barrels. Versatile and Duty-Ready The 8.5-inch length is the “sweet spot” for suppressed use, keeping the overall footprint compact even with a silencer attached. With our customizable options, you can tailor this upper with your choice of M-LOK handguards, specialized bolt carrier groups, and charging handles to meet your specific mission requirements. Key Features: 8.5” 4150 CMV Barrel: Maximum maneuverability with professional-grade durability. 1:5 Twist Rate: Specifically tuned for heavy .338 caliber stability. Big-Bore Reliability: Enlarged ejection port for flawless cycling of 338 ARC brass. The CM15 8.5″ 338 ARC Upper is the definitive choice for shooters who need maximum impact in a minimum profile. Related