The Faxon AR-15 Duty Series SOCOM Upper Receiver Assembly is built for hard-use reliability. The SOCOM profile barrel delivers forward mass for excellent heat dissipation, minimized mirage, and consistent accuracy during rapid or sustained fire- ideal for training, defense, LE/mil applications, or hard-use builds. Features SOCOM Profile for heat resistance, reduced mirage, and accuracy under sustained fire Duty Series 4150 CMV barrel with 1:8 twist for versatile 55- 77gr stabilization Black Nitride (QPQ) finish for corrosion/wear resistance and easy cleaning