Diamondback DB Barrel for 9mm Luger. 10 inch black nitride finished barrel made from 4150 CMV Chrome Moly Vanadium steel. Suitable for AR-15 platform. Caliber: 9mm. Barrel length: 10 inches. Twist: 1:9.84. Finish: Nitride. Weight: 1.10 lbs. Threaded Barrel: No. MFG: Diamondback. MPN: 9X1910M50B984NFR. UPC: 815875019237. Not available to ship to California, Illinois, or Washington.