DIAMONDBACK FIREARMS DB9R CARBON SERIES 9MM LUGER SEMI-AUTO RIFLE The DB9R series is a versatile line of 9mm AR9 pistol caliber carbines, designed for both recreational shooting and self-defense. Known for its durability, the DB9R features a blowback-operated system, is built with forged 7075 T-6 aluminum receivers, a 6061 M-LOK handguard, and outfitted with Magpul furniture. SPECS Caliber: 9mm Barrel: 16 in, Medium, 4150 CrMov, Black Nitride Gas System: Blowback BCG: Diamondback Black Nitride 9R Bolt Carrier Upper: A3 Flattop Forged 7075 T-6 Aluminum, T-Marked Lower: Forged 7075 T-6 Aluminum Dedicated 9mm Lower (Diamondb Mfg: Diamondback