Rosco Manufacturing HSK-125-SOC-556-7-SP-C Husky 5.56 NATO 12.50" Chrome Lined Phosphate 4150 CMV BarrelThe Husky Series gives the take on a SOCOM 12. 5. While this barrel isnt exactly heavy in weight, only a few ounces more than our Bloodline 12. 5 barrel, the Husky profile helps defeat the heat and reduce barrel whip. This barrel is phosphate coated with a chrome lined chamber and bore. Button rifled for that Rosco accuracy.