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Hi Andrew, the twist rate is 1:9 Full specs can be seen here >>> https://diamondbackfirearms.com/portfolio/db1717k005/ Stay safe & have a great day!

1:9 twist

This model's barrel has a 1:9 twist.

Hi Andrew and welcome. ****This model does not have a 1 in 9 twist rate**** This model has a 16" 4150 CMV Barrel with a 1:8 Barrel Twist Rate, A2 Flash Hider and threaded 1/2x28 Thread Pitch.

Andrew, according to the manufacturer this has a 1:8 rh twist rate. Hope this helps, more specs here if interested............. Finish: Black Hard Coat Anodize, Caliber: 5.56 NATO, Barrel: Diamondback Barrels 5.56, 16″, Medium, 4150 CrMov, Black Nitride, 1:8 RH, Gas System: Carbine-Length, BCG: Shot-Peened, Magnetic Particle Inspected Mil Spec 8620 Carrier, Upper: A3 Flattop Forged 7075 T-6 Aluminum, T-Marked, Lower: 7075 T-6 Aluminum (DB-15 Carbon Lower), Handguard: 15″ M-LOK Rail, Grip: MOE Grip, Stock|Brace: MOE Carbine Stock, Magazine: Gen2 PMAG 30 Round, Sights: N/A, Muzzle Device: A2 Flash Hider (1/2 x 28), Trigger: Mil-Spec, Weight: 6.6 lb, Overall Length: (Stock Collapsed 32 1/2″) (Stock Expanded 35 3/4″)