Primary Weapons Systems MK114 Mod 1-M, Upper Receiver, 223 Wylde, 14.5" Barrel, No Muzzle Device, Anodized Finish, Black, MLOK Handguard, Long Stroke Piston System, Adjustable Gas System, Fits AR-15 MK1-M1U-223-14-NC MK1M1U22314NC

Primary Weapons Systems MK114 Mod 1-M Upper | 223 Wylde | 14.5" Barrel | Piston | MK1-M1U-223-14-NC Primary Weapons Systems MK114 Mod 1-M Upper Receiver – 223 Wylde | 14.5" Barrel | Long Stroke Piston | MK1-M1U-223-14-NC The Primary Weapons Systems MK114 Mod 1-M Upper Receiver is a premium piston-driven upper designed for AR-15 platforms. Chambered in 223 Wylde, this upper features a 14.5-inch barrel paired with PWS’s renowned long stroke piston system and an adjustable gas system. Finished in a durable anodized black with a sleek MLOK handguard, the MK114 Mod 1-M delivers exceptional reliability, reduced recoil, and superior heat management. This complete upper is an ideal choice for shooters looking for a high-performance, low-maintenance AR-15 upper without a muzzle device. Key Features of the Primary Weapons Systems MK114 Mod 1-M Upper Long Stroke Piston System – PWS’s signature long stroke piston design provides smoother cycling, reduced recoil, and increased reliability compared to traditional direct impingement systems. Adjustable Gas System – Allows users to fine-tune gas flow for optimal performance with various ammunition types and suppressor use. 223 Wylde Chambering – Optimized chamber delivers excellent accuracy with both .223 Remington and 5.56 NATO ammunition. 14.5" Barrel – Provides a balanced length for improved maneuverability while maintaining strong ballistic performance. MLOK Handguard – Lightweight and modular MLOK rail system offers ample mounting options for accessories. Anodized Black Finish – Durable anodized finish provides excellent corrosion resistance and a professional appearance. No Muzzle Device Included – Allows users to install their preferred muzzle device or suppressor mount. Why Choose the Primary Weapons Systems MK114 Mod 1-M Upper? The Primary Weapons Systems MK114 Mod 1-M Upper stands out as a top-tier choice for shooters who prioritize reliability and performance. Unlike traditional direct impingement AR-15s, the long stroke piston system keeps carbon and heat away from the bolt carrier group, resulting in cleaner operation and longer service intervals. The adjustable gas system gives users precise control over the rifle’s cycling, making it an excellent platform for suppressed shooting or running a wide variety of ammunition. The 223 Wylde chamber ensures outstanding accuracy, while the 14.5-inch barrel offers a great balance between velocity and handling. Primary Weapons Systems has built a strong reputation for producing innovative and durable AR components, and the MK114 Mod 1-M continues that tradition with its robust construction and thoughtful engineering. Whether you’re building a home defense rifle, a competition carbine, or a suppressed tactical platform, this upper provides the reliability and versatility serious shooters demand. This upper receiver is an excellent choice for custom AR-15 builds, suppressed rifles, and high-reliability applications. Specifications Manufacturer: Primary Weapons Systems Model: MK114 Mod 1-M Upper Model Number: MK1-M1U-223-14-NC UPC: 811154033482 Caliber: 223 Wylde Barrel Length: 14.5" Operating System: Long Stroke Piston Gas System: Adjustable Handguard: MLOK Finish: Anodized Black Compatibility: AR-15 Platform Muzzle Device: None Included Ideal Applications for the Primary Weapons Systems MK114 Mod 1-M Upper This upper is ideal for custom AR-15 builds, suppressed firearms, home defense, and tactical applications. Experience the performance of the Primary Weapons Systems MK114 Mod 1-M Upper. A premium 223 Wylde AR-15 upper featuring a long stroke piston system, adjustable gas block, and MLOK handguard. The End