MK116 Compound 223 Wylde Semi-Auto Rifle SPECIFICATIONS: Operating System: PWS Long Stroke Piston System, 3 setting Adjustable Gas Regulator Caliber: .223 Wylde Barrel Length: 16.1" Gas System Length: Mid-Length Barrel Twist Rate: 1:8 Muzzle Velocity: 2980fps Muzzle Device: PWS FSC 556 Upper Receiver: PWS Proprietary Piston Upper, T6 7075 Forged, Anodized Handguard: PWS M-Lok(TM) 15.05" Handguard (1.7" width, 2.25" height) Charging Handle: Radian Raptor(TM) Ambidextrous Charging Handle Lower Receiver: PWS ambidextrous MK1 MOD 2-M Multi-Caliber Lower, 7075-T651 Hard coat anodize, per Mil Mfg: Primary Weapons