The Primary Weapons Systems MK1 MOD 2-M upper for AR rifles delivers the reliability of a long-stroke piston system with refined exclusives in a sleek, ready-for-action package. Built around a 16.1" 223 Wylde barrel with a 1:8 twist, this upper achieves impressive muzzle velocity and accurate performance across a broad spectrum of .223/5.56/.223 Wylde loads, while the PWS FSC 556 provides controlled operation and enhanced reliability under demanding conditions. The fully forged T6 7075 upper and lower receivers, combined with a forward-leaning design that eliminates a forward assist, a flared mag well, and a built-in trigger guard, reflect meticulous craftsmanship and user-focused ergonomics. The PicLok 15.05" handguard adds mounting versatility by accepting both Picatinny and M-LOK accessories, ensuring a clean, modular setup for optics, grips, and ancillary gear. Radian Raptor ambidextrous charging handle and the proprietary Piston Upper underscore a commitment to smooth cycling, reduced heat transfer, and durable performance. Finished in an anodized black, this compact, high-end upper is ready to perform in precision shooting, duty-grade applications, or demanding field use.