It sounds like there might be a mix-up in the description. The Diamondback DB15 is typically known as a rifle rather than a handgun and is chambered in rifle calibers like 5.56 NATO or .300 Blackout, not typically a handgun caliber. Here's a revised version assuming it's about the rifle: The Diamondback DB15 delivers exceptional performance in a lightweight, durable and reliable design ideal for tactical applications. Chambered in .300 Blackout with a 10 inches barrel, this rifle features an optics-ready rail, an M-LOK handguard for accessory attachment and comes equipped with a 28-round magazine. built for precision and adaptability, the DB15 is ready-to meet the demands of various shooting scenarios with ease and reliability.