Diamondback DB 5.56mm NATO Vanadium Steel Pistol Barrel - 5.5in - Black Nitride - The DB Barrel is optimized with a 1:8 twist rate, offering excellent stability for a variety of bullet weights, making it versatile for different shooting needs. The pistol-length gas system ensures reliable cycling in short-barreled configurations, while the heavy profile enhances durability and reduces barrel flex during rapid-fire sequences. The Nitride finish not only improves wear resistance but also gives the barrel a sleek black appearance, making it a durable and stylish choice for compact builds or pistol configurations. 1:8 Threaded Barrel: 1/2 x 28 Material: Chrome Moly Vanadium Steel Barrel Type: Heavy Profile, Pistol-Length Gas System