MK114 MOD 1-M Specs: - Operating System: PWS Long Stroke Piston System 3 setting Adjustable Gas Regulator - Caliber: .223 Wylde - Barrel Length: 14.5 - Gas System Length: Mid-Length - Barrel Twist Rate: 1:8 - Muzzle Velocity: 2921 fps - Muzzle Device: No muzzle device included. All NFA rules apply. - Upper Receiver: PWS Proprietary Piston Upper T6 7075 Forged Anodized - Handguard: PWS M-Lok 13.624 Handguard (1.7 width 2.25 height) - Charging Handle: Radian Raptor Ambidextrous Charging Handle