The Tiger Rock Inc. BR377-P AR-300BLK/300AAC 7.5" Inch Pistol Length Barrel offers exceptional performance for serious shooters. Designed specifically for the AR-15 platform, this barrel features a 1:8 twist rate, ensuring optimal stabilization of .300 AAC Blackout rounds for superior accuracy. Built from high-quality 4150 heat-treated steel and finished with a robust Parkerized coating, this barrel guarantees durability and reliability in all conditions. With a compact design, it seamlessly integrates into any firearm setup. Length: 7.5" .300 BLK (AAC Blackout) 1:8 Twist .750" gas block diameter Pistol gas system with a 0.125" gas hole diameter 5/8"x24 Thread Pitch 4150 gun quality heat treated steel Parkerized Made in the U.S.A. Fits: AR-15 Enhance your shooting experience with the Tiger Rock Inc. barrel, designed for those who value performance and precision.