Rosco Husky 11.5 inch AR-15 barrel with Chrome Lined Phosphate finish. 5.56 NATO, 4150 CMV steel. Chrome-lined chamber and bore with phosphate exterior finish. Threaded 1/2x28 for carbine-length gas system. Heavy Husky SOCOM-inspired profile reduces heat and barrel whip. Barrel length 11.5", twist 1:7, rifled bore. Fits AR-15 platforms. Mfg part number HSK-115-SOC-556-7-C-CL; UPC 850039693359. Not shippable to CA, IL, MA, WA.