The PWS MK1 MOD 2-M Complete Upper features an advanced long stroke piston system with a 16.1" .223 Wylde barrel and comes equipped with the PWS FSC 556 muzzle device for superior performance and reliability.PWS MK1 MOD 2-M Complete Upper Receiver16.1" .223 Wylde barrel with 1:8 twist rateMuzzle velocity: 2 980 fpsPWS proprietary piston system with T6 7075 forged anodized upperPatent-pending PicLok 15.05" free-float handguard (Picatinny/M-LOK compatible)Radian Raptor ambidextrous charging handleIncludes PWS FSC 556 muzzle deviceEngineered for professional and enthusiast shooters who demand precision and reliability this complete upper assembly combines cutting-edge piston technology with versatile mounting options for accessories and optics.