The Primary Weapons Systems MK1 MOD 1-M UPR 16" 7.62x39mm Black delivers a rugged, all-purpose AR upper built around PWS's renowned long stroke piston system, refined for 2018 to pair reliability with true mil-spec design. Internally, this complete upper maintains the proven piston operation while offering a forged upper and lower, a free-float M-LOK handguard, and forward assist controls that integrate seamlessly into a hard-use platform trusted by civilians and Law Enforcement alike. The 16.1" barrel with a mid-length gas system and a 1:8 twist ensures dependable cycling and stabilization for varied 7.62x39mm loads, complemented by the PWS FSC 556 muzzle device for effective recoil management. Radian Raptor ambidextrous charging handle comes standard, enhancing usability across shooting positions and rapid follow-ups, while the anodized T6 7075 forged components provide lasting durability. Whether mounted on complex carbine configurations or deployed as a resilient patrol upper, this MK1-MOD 1-M upper is designed to be a high-value, relentless tool that performs under pressure and in ever-changing field conditions.