The Tiger Rock Inc. BR167-SC 5.56 NATO 16" Mid Length Barrel is engineered for performance and reliability in the most demanding conditions. Crafted from high-grade 416R stainless steel, this barrel features a durable black nitride finish that ensures longevity and precise shooting, making it perfect for competitive environments. Length: 16" Caliber: 5.56 NATO Twist Rate: 1:7 Gas Block Diameter: .750" Gas System: Mid Length with 0.07 hole diameter Thread Pitch: 1/2"x28 Finish: Black Nitride Material: 4150 Chrome Moly Vanadium Made in the U.S.A. Compatibility: AR-15 platforms Elevate your shooting experience with the impeccable craftsmanship of the Tiger Rock Inc. BR167-SC barrel.