The Tiger Rock Inc. BR308-20N AR-10/LR-308 Rifle Length Barrel combines cutting-edge technology with robust construction, ensuring exceptional performance on every shot. Expertly crafted from high-grade 4150 gun steel and finished with a black nitride coating, this barrel delivers unmatched durability, making it perfect for serious shooters seeking reliability in any condition. Length: 20" 1:10 Twist .750" gas block diameter Rifle Length with a 0.125" gas hole diameter 5/8"x24 Thread Pitch 4150 gun quality steel, heat treated to RC 28-32 hardness, stress relieved Black Nitride finish Light Contour Match Grade Made in the U.S.A. Fits: AR-10 DPMS Compatible Experience precision and power with the BR308-20N barrel, engineered for the ultimate shooting performance.