Just what is the Gunner profile? The Gunner profile is a blend of two of the best performing profiles of all time, Gov't and Pencil.  Proving that every once and awhile, the Government can do something right, the Gunner's profile from the extension to the gas block mimics that well-known taper. From there, innovation takes over and the Gunner moves to a .750" gas block journal and our famed pencil profile out front. Removing the weight from the front of the barrel ensures maximum versatility and keeps material to the rear to maximize heat resistance and mitigate whip. Technical Specifications Barrel Material: 4150 Certified Gun Barrel Quality Steel Barrel Type: Button Rifled  Barrel Caliber: 300 BLK Barrel Twist: 1:8 Barrel Length: 10.5” Barrel Profile:  GUNNER Barrel Gas System: Pistol Inside Finish: QPQ Nitride Outside Finish: QPQ Nitride Muzzle Thread: 5/8-24 TPI (Threads Per Inch)  Gas Block Diameter: .750"  Gas Block Journal Length: 1.9" Barrel Extension: M4  Weight:  1.10 lbs Magnetic Particle Inspected! 11-degree Target Crown