Rosco Bloodline Barrel Features The Rosco Manufacturing Bloodline Barrel in 5.56 NATO is built around a mid-length gas system that was designed around USASOC specifications for an Improved Upper Receiver Group. The longer gas system produces a smoother gas curve than carbine-length setups which translates into reduced bolt velocity and more manageable dwell times. A 1:7 twist rate stabilizes a wide range of 5.56 and .223 Rem bullet weights from lightweight varmint loads to heavier match bullets. This combination gives shooters a dependable balance of speed and accuracy in a drop-in upgrade for their AR-15 build. Constructed from Chrome Moly Vanadium steel the barrel is finished with a black Nitride coating that resists corrosion and wear while requiring minimal maintenance. The 14.5 length keeps the barrel compliant with standard configurations while still delivering strong velocity retention for 5.56 NATO ammunition. A 1/2x28 threaded muzzle allows shooters to install their choice of brake flash hider or suppressor adapter. At 26.34 oz this barrel adds Rosco s touch to a proven military spec design without unnecessary bulk on the completed rifle. Rosco Bloodline Barrel Specifications Manufacturer: Rosco Model: Bloodline Barrel Caliber: 5.56 NATO Material: Chrome Moly Vanadium Finish: Nitride Barrel Type: Mid-Length Twist Rate: 1:7 Barrel Length: 14.5 Thread Pattern: 1/2x28 Weight: 26.34 oz Available At: GrabAGun