Ballistic Advantage Modern Series, DRP Profile Barrel, 300 Blackout, Fits AR15, 16 Threaded Barrel, 5/8x24 Thread Pitch, 1:7 Barrel Twist, Pistol Length Gas System, QPQ Finish, Black BABL300011M This .300 Blackout chambered 16 inch Modern Series Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension.