Rosco Manufacturing Husky AR-15 5.56x45mm NATO Threaded AR Barrel Phosphate/Chrome Black 12.5in. 3. While this barrel isn't exactly heavy in weight only a few ounces more than the Bloodline 10.5" 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 Specifications for Rosco Manufacturing Husky AR-15 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 AR-15 5.56x45mm NATO Threaded AR Barrel What firearm models does the manufacturer say Rosco Manufacturing Husky AR-15 5.56x45mm NATO Threaded AR Barrel is compatible with? The manufacturer suggests that Rosco Manufacturing Husky AR-15 5.56x45mm NATO Threaded AR Barrel is compatible with AR-15Rosco Manufacturing HSK-125-SOC-556-7-SP-CL: Husky AR-15 5.56x45mm NATO Threaded AR Barrel Phosphate/Chrome Black 12.5in