Rosco Bloodline Features The Rosco Manufacturing Bloodline barrel is built around USASOC specifications for an Improved Upper Receiver Group giving builders a barrel profile and gas system tuned to the same standards used by military special operations units. Machined from chrome moly vanadium steel the barrel balances strength and weight for reliable performance across a wide range of shooting conditions. A nitride finish adds corrosion resistance and reduces friction inside the bore helping the barrel resist wear over extended use. The 1:7 twist rate stabilizes a broad range of 5.56 NATO bullet weights from lighter varmint loads up to heavier match projectiles. This mid-length barrel s longer gas system produces a smoother gas curve than a comparable carbine-length setup which leads to more consistent bolt dwell times and gentler cycling on the action. That smoother cycle translates into a more controllable rifle especially during rapid strings of fire. Threaded 1/2x28 at the muzzle the barrel accepts standard muzzle devices and compensators without modification. At just under 29 ounces the Rosco Bloodline barrel adds Rosco s own refinements to a proven military-inspired design for AR-15 builders seeking speed and performance. Rosco Bloodline Specifications Manufacturer: Rosco Model: Bloodline Caliber: 5.56 NATO Material: Chrome Moly Vanadium Finish: Nitride Barrel Type: Mid-Length Twist: 1:7 Length: 16 Thread Pattern: 1/2x28 Weight: 28.97 oz Barrel Length: 16 Available At: GrabAGun