Diamondback DB15 Carbon 300 AAC Blackout 16in Black Hardcoat Anodize Semi Automatic Modern Sporting Rifle - 30+1 Rounds - The Carbon Series DB15 is Diamondback's entry level line, offering an outstanding value in an AR-15. The Carbon Series provides all of the reliability and basic features that you need from a rifle and nothing that you don't. Outfitted with Magpul furniture, a DB Carbon lower, and an M-LOK compatible free float handguard, the Carbon Series DB15 is ready for anything at a price you can afford. Threaded Barrel: 5/8 x 24; A2 Flash Hider; Magpul MOE Grip and Stock;