The PWS MK1 MOD 2-M Complete Upper features a revolutionary long stroke piston system with 16.1-inch barrel chambered in .223 Wylde. This premium upper assembly showcases PWS's latest innovations including patent-pending PicLok technology and T6 7075 forged construction.PWS MK1 MOD 2-M Complete Upper ReceiverCaliber: .223 Wylde with 1:8 twist rate16.1" barrel length with mid-length gas systemPWS Long Stroke Piston System with 3-setting adjustable gasPatent-pending PicLok 15.0" free float handguardFSC 556 muzzle device includedRadian Raptor ambidextrous charging handleT6 7075 forged and anodized upper receiverMuzzle velocity: 2980 ft/secPerfect for precision shooting and tactical applications this complete upper delivers exceptional reliability and accuracy. The PicLok handguard allows mounting of both Picatinny and M-LOK accessories making it versatile for any mission or shooting scenario.