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Hi John and welcome. This model has a 16" 4150 CrMov Barrel 1:8 Barrel Twist A2 Flash Hider 1/2x28 Thread Pitch Cheers and stay safe!

Hi John, this has a 16″, Medium, 4150 CrMov, Black Nitride barrel with a twist rate of 1:8 RH Full specs here >>> https://diamondbackfirearms.com/portfolio/db1717k171/ Stay safe & have a great day!

John, this has a 16 inch barrel with a 1:8 twist rate. Hope this helps, more specs here if interested................... AR15 Semi Automatic Rifle, Direct Impingement, Carbine Gas System, 5.56 NATO (Also Accepts .223 Remington), 30 Rounds, 16" 4150 CrMov Barrel, 1:8 Barrel Twist, A2 Flash Hider, 1/2x28 Thread Pitch, 7075 Aluminum Receivers, Mil-Spec Trigger, M4 feed Ramps, 12" M-LOK Handguard, Magpul MOE Collapsible Stock, Magpul Pistol grip, Overall Length 35.75", Weight 6.6 lbs, Tiger Strip Camo Finish.

1:8 see ***** Diamondback AR-15 Specifications and Features: Diamondback Item Number: DB1717K171 AR15 Semi Automatic Rifle Direct Impingement Carbine Gas System 5.56 NATO (Also Accepts .223 Remington) 30 Rounds 16" 4150 CrMov Barrel *******1:8 Barrel Twist A2 Flash Hider 1/2x28 Thread Pitch 7075 Aluminum Receivers Mil-Spec Trigger M4 feed Ramps 12" M-LOK Handguard Magpul MOE Collapsible Stock Magpul Pistol grip Overall Length 35.75" Weight 6.6 lbs Tiger Strip Camo Finish