Primary Weapons Systems MK107 Mod 1-M 223 Wylde 7.75in Complete Upper

The MK107 MOD 1-M 223 Wylde complete upper receiver from Primary Weapons Systems delivers a rugged, ready-to-shoot platform with a compact 7.75-inch pistol-length barrel and a true 1-8 twist, optimized for a wide range of .223 Wylde cartridges. Built to exacting PWS standards, this anodized black upper ships complete and includes a pistol-length contour that pairs perfectly with compatible receivers for a streamlined build. The 7.75" barrel offers quick-handling maneuverability without sacrificing accuracy, making it an ideal choice for close-quarters engagements, dynamic range work, or integration into a compact patrol rifle or precision-oriented setup. Designed with the MK107 Mod 1-M lineage in mind, it provides reliable gas performance and harmonious cycling with compatible components, enabling smooth operation across multiple ammunition types while maintaining durable finish and dependable repeatability. The complete upper ensures proper alignment and fit with Primary Weapons Systems components, allowing shooters to maximize their weapon's potential with minimal assembly effort. Ideal for sport shooting, tactical applications, and professional builds, this upper receiver assembly combines rugged construction, proven geometry, and the versatility of a 223 Wylde chambering in a compact, easy-to-handle package. Whether upgrading an existing build or starting fresh, this PWS offering helps you achieve a precise, consistent platform for accurate, fast follow-up shots.