Rock River Arms 20in .308 CM Varmint Barrel Black. 62x51mm NATO 20in CM Varmint Threaded Barrel then you've arrived at the absolute right place.. Formulated by using several of the most heavy duty and dependable materials in existence these AR15 Barrels through Rock River Arms will provide you with a product that will give you years of consistency. Rock River Arms has been making top quality merchandise for a very long time and the Rock River Arms 7.62x51mm NATO 20in CM Varmint Threaded Barrel is their way of showing you how much they care. At OpticsPlanet we ensure that it is our responsibility to purchase the most suitable product for your requirements and exhibiting the Rock River Arms 7.62x51mm NATO 20in CM Varmint Threaded Barrel is something that we're happy to offer. Specifications for Rock River Arms 7.62x51mm NATO 20in CM Varmint Threaded Barrel: Manufacturer: Rock River Arms Color: Black Fabric/Material: Chrome Moly Caliber: 7.62x51mm NATO Barrel Length: 20 in Barrel Profile: Varmint Gas System Length: Rifle Length Gas Block Journal Size-Diameter: .936 in Threads per Inch: 5/8x24 Barrel Twist Rate: 1-10 Flutes: No Gun Make: Rock River Arms Gun Model: Universal Weight: 68 oz Package Contents: Rock River Arms 7.62x51mm NATO 20in CM Varmint Threaded Barrel What firearm models does the manufacturer say Rock River Arms 7.62x51mm NATO 20in CM Varmint Threaded Barrel is compatible with? The manufacturer says that Rock River Arms 7.62x51mm NATO 20in CM Varmint Threaded Barrel is compatible with UniversalRock River Arms 308A0234: 20in .308 CM Varmint Barrel Black