Primary Weapons Systems MK109 MOD 1-M, Upper Receiver, Fits AR-15, 300 Blackout, 9.75" Barrel, 1:8" Twist, PWS Triad Muzzle Device, 8.9" PWS PicLok MLOK Handguard, Anodized Finish, Black, Includes Radian Raptor Ambidextrous Charging Handle MK1-M1U-300BLK-9 MK1M1U300BLK9

PWS MK109 MOD 1-M Upper Receiver | .300 Blackout | 9.75" Barrel | MK1M1U300BLK9 Primary Weapons Systems MK109 MOD 1-M Upper Receiver – .300 Blackout | 9.75" Barrel | Radian Raptor | MK1M1U300BLK9 The Primary Weapons Systems MK109 MOD 1-M Upper Receiver is a premium, complete upper assembly designed for serious shooters who demand reliability, accuracy, and modern features. Chambered in .300 Blackout, this upper features a 9.75-inch barrel with a 1:8 twist rate, making it ideal for both supersonic and subsonic ammunition. Equipped with the innovative PWS Triad muzzle device and an 8.9-inch PWS PicLok M-LOK handguard, the MK109 offers exceptional modularity and performance. This model also includes a high-quality Radian Raptor ambidextrous charging handle, providing smooth operation and enhanced ergonomics. Finished in a durable black anodized coating, this upper is built to deliver consistent performance in a compact package. Key Features of the Primary Weapons Systems MK109 MOD 1-M Upper .300 Blackout Chambering – Optimized for both supersonic and subsonic loads with excellent terminal performance. 9.75" Barrel with 1:8 Twist – Provides strong velocity and accuracy while maintaining a compact overall length. PWS Triad Muzzle Device – Advanced muzzle device designed for reduced recoil and improved gas management. 8.9" PWS PicLok M-LOK Handguard – Lightweight and modular handguard with integrated Picatinny and M-LOK mounting options. Radian Raptor Ambidextrous Charging Handle – Premium ambidextrous charging handle for smooth and reliable operation from either side. Anodized Black Finish – Durable anodized finish provides corrosion resistance and a professional appearance. Why Choose the Primary Weapons Systems MK109 MOD 1-M Upper Receiver? The Primary Weapons Systems MK109 MOD 1-M Upper Receiver is an excellent choice for builders looking to create a compact, high-performance .300 Blackout AR-15. The 9.75-inch barrel offers a great balance between maneuverability and ballistic performance, making it ideal for home defense, suppressed shooting, and short-to-medium range applications. The inclusion of the PWS Triad muzzle device enhances recoil control and gas efficiency, while the PicLok handguard provides ample real estate for accessories. The addition of the Radian Raptor ambidextrous charging handle elevates the overall user experience with its smooth operation and ambidextrous design. Primary Weapons Systems is known for producing high-quality, innovative components, and this upper continues that reputation with its thoughtful engineering and premium features. Whether you’re building a suppressed SBR, a compact home defense rifle, or a versatile .300 Blackout platform, the MK109 MOD 1-M delivers the performance and reliability serious shooters expect. This upper receiver is an excellent choice for suppressed builds, home defense, and compact .300 Blackout rifles. Specifications Manufacturer: Primary Weapons Systems (PWS) Model: MK109 MOD 1-M Model Number: MK1M1U300BLK9 UPC: 811154033451 Caliber: .300 Blackout Barrel Length: 9.75" Twist Rate: 1:8 Handguard: 8.9" PWS PicLok M-LOK Muzzle Device: PWS Triad Charging Handle: Radian Raptor Ambidextrous Finish: Black Anodized Platform: AR-15 Ideal Applications for the PWS MK109 MOD 1-M This upper receiver is ideal for suppressed .300 Blackout builds, home defense rifles, and compact tactical platforms. Experience premium performance with the Primary Weapons Systems MK109 MOD 1-M Upper Receiver. A feature-rich .300 Blackout upper featuring a 9.75" barrel, PWS Triad muzzle device, and Radian Raptor charging handle. The End