Primary Weapons Systems Mk116 Mod 1 223 Wylde 16.1 Upper FSC556 Piston

The Primary Weapons Systems MK116 MOD 1-M upper advances the 2018 lineup with PWS's long-stroke piston system in a reliable 223 Wylde configuration, delivering the proven performance, durability, and mil-spec feel that civil shooters and law enforcement alike rely on. Built around fully forged upper and lower receivers, this 16.1" FSC556-equipped upper features a mid-length piston, a free-float M-LOK handguard, a forward assist, and a true-to-mil-spec design that translates to predictable function and effortless suppression compatibility, while the 1:8 twist ensures stable, versatile barrel stability for a broad spectrum of ammunition. The rifle ships with a FSC556 compensator to manage recoil and muzzle rise, a Radian Raptor charging handle for smooth operation, and a three-setting adjustable gas system that lets shooters tune performance to their optics, ammo, and mission profile. With a weight around 4 lb 11 oz and a compact 25" overall length, the MK116 MOD 1-M is a go-to option for law enforcement communities seeking non-NFA configurations and for civilian operators who demand relentless reliability in a high-value platform. This upper is designed to integrate with standard components while delivering hardened durability, easy maintenance, and a seamless fit for a fast-action, long-range capable build.