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

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.

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!

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!