The Faxon Duty Series 10.50″ Gunner 300 BLK barrel combines exceptional balance and durability for short versatile builds. Our Gunner profile merges the robustness of a Govt contour with the lightweight maneuverability of a Pencil profile. Machined from 4150 CMV steel and button rifled with a 1:8 twist each barrel is fully stress relieved and treated with salt bath nitride inside and out for corrosion resistance and long service life.