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This has a Medium, 4150 CrMov, Black Nitride Barrel with a 1:8 RH twist ratio. It's also threaded with 1/2×28 thread pitch. Hope this helps.

1:8 RH twist ratio with a medium profile

Michael, this UPC code has a 1 in 8 Right Hand Twist Rate Medium Profile Barrel Sir. Cheers and stay safe!

Michael, Barrel: Diamondback Barrels 5.56, Carbine Length, 16 in., Medium, 4150 CrMov, Black Nitride Twist: 1:8 RH, Muzzle Device: A2 Flash Hider [1/2 x 28] Details here >>> https://diamondbackfirearms.com/portfolio/db15ccmlmb/ .....Have a great day!