The Tiger Rock Inc. BR9-4 AR-9/9X19 barrel is expertly designed for precision and reliability, elevating your shooting experience to new heights. With its 4.5-inch length tailored specifically for 9mm applications, this barrel assures excellent stability and unparalleled accuracy. Crafted in the USA from durable 4150 gun quality steel, the barrel features a black nitride finish for enhanced corrosion resistance. The optimized 1:10 twist rate guarantees perfect projectile stability, while the versatile 1/2x36" thread pitch allows for seamless customization. 4.5-inch length tailored for 9mm caliber 1:10 twist rate enhances accuracy 1/2x36" thread pitch for customization Constructed from 4150 gun quality steel Black nitride finish for corrosion resistance Enhance your AR-15 platform with the Tiger Rock BR9-4 for unmatched performance and craftsmanship.