This AR-15 Barrel is a 5.5" Pistol contour barrel made out of 4150 Chrome Moly Vanadium steel with a black nitride finish, a 1:10 twist rate. The barrel is chambered in 9mm. Finished Barrels go through a 100% Inspection Process.
Finish: Black Nitride
Material: 4150 Chrome Moly Vanadium
Thread Pitch: 1/2x36
Feed Ramp: None
Gas System: None