Product Description The Primary Weapons Systems MK114 MOD 2-M Upper is a purpose-built upper receiver assembly engineered for precision and reliability on AR-15 compatible platforms. Chambered in 6mm ARC (Advanced Rifle Cartridge) with a 14.5-inch barrel, this upper delivers flat trajectories, excellent downrange energy retention, and improved long-range performance ideal for hunting, competition shooting, and precision fire missions. The Long Stroke (LS) piston-driven operating system is a hallmark of PWS craftsmanship, providing reliable cycling under adverse conditions while reducing carbon fouling in the receiver. Paired with a Forward Railed Chassis (FRC) handguard and a compensator muzzle device, the MK114 MOD 2-M balances lightweight handling with rigid structural alignment, offering shooters a dependable platform for controlled follow-up shots and sub-MOA accuracy potential with quality optics and ammunition. Product Highlights 6mm ARC Chamber: Delivers superior ballistic performance with flat trajectory, high ballistic coefficient, and exceptional long-range energy retention compared to traditional AR-15 cartridges. Long Stroke Piston Operating System: PWS signature LS piston system ensures reliable, consistent cycling while keeping the bolt carrier group cleaner and cooler than direct impingement alternatives. 14.5-Inch Barrel: Optimized barrel length strikes the balance between compact handling and full powder burn for 6mm ARC, maximizing velocity without sacrificing maneuverability. Forward Railed Chassis (FRC) Handguard: Lightweight, free-floating design allows for seamless attachment of optics, lights, lasers, and other accessories while maintaining consistent barrel harmonics. AR-15 Compatible: Drop-in compatibility with standard AR-15 lower receivers makes this upper an ideal upgrade for shooters looking to enhance accuracy and performance on an existing platform. Specs Brand: Primary Weapons Systems Model: MK114 MOD 2-M Upper Caliber: 6mm ARC (Advanced Rifle Cartridge) Barrel Length: 14.5 inches Operating System: Long Stroke (LS) Piston Handguard: Forward Railed Chassis (FRC) Muzzle Device: Compensator (Comp) Platform Compatibility: AR-15 Compatible Weight: 5.3 lbs UPC: 811154033277 MPN: MK1M2U6ARC14 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>