Primary Weapons 2M114UA01-2F-Nc MK114 Mod 2-M 223 Wylde 14.50" Anodized Barrel For AR-15 The MK114 Mod 2-M Upper operates On The highly acclaimed PWS Long Stroke Piston System, renowned For Its Reliability And Reduced Fouling. The Inclusion Of a 3-Setting Adjustable Gas System Allows users To Fine-Tune Gas Flow, ensuring Optimal Performance In Diverse Shooting conditions as Well as optimizing It For Suppressor Use. This Innovative System Not Only enhances Reliability But Also provides Adaptability To Various Ammunition Types And Environmental factors. Caliber: 223 Wylde Barrel Length: 14.50" Barrel Material: 416R Steel Twist: 1:8" Barrel Finish: Anodized