The Primary Weapons MK1 Mod 2-M Upper is a high-performance 11.85 assembly chambered in 223 Wylde. It features the elite PWS long-stroke piston system and a 1:8 twist barrel with a black finish and a PWS Triad muzzle device. The 7075-T6 aluminum receiver is paired with an 11 PicLok free-float handguard, allowing for simultaneous use of M-LOK and Picatinny accessories. This optics-ready complete upper includes a Radian Raptor charging handle and is designed for seamless integration with any standard AR-15 lower, providing a cleaner-running alternative to direct impingement systems.