The PWS MK116 MOD 1-M upper from Primary Weapons Systems delivers a robust, high-value AR platform upgrade built around the proven PWS long stroke piston system, offering reliable, cleaner operation under demanding conditions for civilians and law enforcement alike. Internally, this aluminum upper features a fully forged M-LOK handguard with a true mil-spec design, forward assist controls, and a forged upper and lower receiver package that emphasizes durability and precision. The 16.1" 223 Wylde barrel with a 1:8 twist delivers consistent accuracy and a muzzle velocity around 2980 feet per second, while the free-float profile minimizes harmonics for better shot placement. The system is enhanced by the PWS FSC 556 muzzle device and a proprietary PWS piston upper, all anodized for lasting corrosion resistance. Completing the package is the ambidextrous Radian Raptor charging handle, which provides smooth, reliable operation in both right- and left-handed configurations. The MK1 MOD 1-M upper is designed for AR rifles that demand a no-nonsense tool capable of delivering relentless performance in a variety of environments, making it a dependable choice for serious shooters who value consistency, modularity, and enduring value.