Diamondback Firearms OEM Replacement AR-15 5.56x45mm NATO Threaded Rifle Barrel 16 inch Medium Profile Mid-Length 1-8 Twist 1/2 x 28 Thread 4150 CrMov. 56x45mm NATO 16in Mid-Length Black Ni - Replace your barrel or finish your build with this 16in black nitride barrel from Diamondback Made of 4150 CMV with a mid-length gas system. Specifications for Diamondback Firearms OEM Replacement AR-15 5.56x45mm NATO Threaded Rifle Barrel: Manufacturer: Diamondback Firearms Color: Black Nitride Finish: Nitride Caliber: 5.56x45mm NATO Barrel Length: 16 in Barrel Profile: Medium Gas System Length: Mid Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-8 Barrel Material: 4150 CMV Steel Gun Make: Diamondback Gun Model: AR-15 Length: 16 in Package Contents: Diamondback Firearms OEM Replacement AR-15 5.56x45mm NATO Threaded Rifle Barrel What firearm models does the manufacturer say Diamondback Firearms OEM Replacement AR-15 5.56x45mm NATO Threaded Rifle Barrel is compatible with? The manufacturer says that Diamondback Firearms OEM Replacement AR-15 5.56x45mm NATO Threaded Rifle Barrel is compatible with AR-15Diamondback Firearms 556M16M50B8R: OEM Replacement AR-15 5.56x45mm NATO Threaded Rifle Barrel 16 inch Medium Profile Mid-Length 1-8 Twist 1/2 x 28 Thread 4150 CrMov Black Nitride