The 24" barrel is definitely the item of a whole new manufacturing process produced by Mossberg to lead to extra exact shot placement when utilizing manufacturing facility generated ammunition. The barrel is topped with a vented rib and outfitted with a HIVIZ TriComp fiber-optic front sight. Taran Tactical Innovations (TTI) https://elliothblbo.azzablog.com/29267091/considerations-to-know-about-mossberg-590-a1-shockwave