Rosco Manufacturing Husky 5.56 Nato Threaded Barrel Phosphate/Chrome Black 12.5in. While this barrel isnt exactly heavy in weight only a few ounces more than 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 Specifications for Rosco Manufacturing Husky 5.56x45mm NATO Threaded AR Barrel: Manufacturer: Rosco Manufacturing Color: Black Finish: Chrome Lined Phosphate Fabric/Material: 4150 CMV Caliber: 5.56x45mm NATO Barrel Profile: SOCOM Barrel Twist Rate: 1-7 Gun Make: AR Platform Gun Model: AR-15 Weight: 2.6 lb Gun Type: Rifle Firearms Threads Per Inch: 1/2x28 Package Contents: Rosco Manufacturing Husky 5.56 Nato Threaded Barrel What firearm models does the manufacturer say Rosco Manufacturing Husky 5.56x45mm NATO Threaded AR Barrel is compatible with? The manufacturer suggests that Rosco Manufacturing Husky 5.56x45mm NATO Threaded AR Barrel is compatible with AR-15Rosco Manufacturing HSK-125-SOC-556-7-SP-CL: Husky 5.56 Nato Threaded Barrel Phosphate/Chrome Black 12.5in