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Timothy, rifling twist is 1 in 9 RH,

1 in 9 Timothy. --- (Complete Features and Specifications): - Diamondback Firearms DB15 Rifle - AR-15 Style Rifle - Caliber: 5.56 NATO/.223 Remington - Capacity: 30-Round Magazine - Action: Semi-Automatic - Barrel: 16" 4140 Chrome-Moly, M4 Contour Free-Float Barrel - Rifling: 1:9" Twist - Muzzle Device: A2 Flash Hider - Handguard: 10" Diamondback Aluminum Quad Rail - No Sights-Optic Ready - Stock: 6-Position Collapsible - Gas System: Carbine-Length Gas Impingement System - Grip: A2 Style Pistol Grip - Upper Receiver: A3 Flattop Forged 7075 T6 Aluminum, T-Marked - Lower Receiver: Forged 7075 T6 Aluminum Lower - Bolt: 158 Carpenter Steel - Bolt Carrier: Shot-Peened, Magnetic Particle Inspected Mil Spec 8620 Carrier, Melonite Coated - Weight: 6.65 lbs - Length: 32.5"-36.25" Adjustable - Finish: Anodized, Black.

1:9 twist see *****Key Specifications Caliber: 5.56mm NATO Action: Semi-auto (gas impingement) Round capacity: 30+1 Barrel length: 16" Barrel material: 4140 chrome-moly steel *********Barrel twist: 1/9" Stock: 6-position ATI Strikeforce Upper receiver: Forged 7075 T6 aluminum, T-marked Lower receiver: Forged 7075 T6 aluminum Handguard: 10" quad rail Pistol grip: Polymer Sights: Optics-ready Flash hider: A2 Overall length: 32.5-36.25" Overall weight: 6.65 lbs. MFG Number: DB15CCB UPC: 815875011682