The Tiger Rock Inc. BR40-4 AR-40/.40 S&W 4" Barrel is the definitive choice for firearm enthusiasts pursuing precision and high performance. Constructed from premium 4150 gun steel with a black nitride finish, this barrel ensures durability, corrosion resistance, and a reliable shooting experience. With its perfectly balanced 4-inch length, it is tailored for .40 S&W caliber while promoting bullet stability and accuracy. Manufactured from high-quality 4150 gun steel Durable black nitride finish for enhanced corrosion resistance 1:16 twist rate for improved bullet stability 5/8x24" thread pitch for easy muzzle device attachment Proudly made in the USA for guaranteed quality Elevate your firearm's performance with the Tiger Rock BR40-4, where exceptional engineering meets reliability.