Upper: AR15 Upper w/ Forward AssistBarrel: 16" Wilson Combat 300 Blackout Barrel Stainless Steel Bead Blasted Barrel Twist: 1:7 twist rateBarrel Material: Stainless Steel, Type 416R, Barrel GradeBarrel Finish: Bead BlastedGas System Length: PistolGas Block Journal: .750"Barrel Thread pitch: 5/8 x 24Muzzle Device: Flash HiderRail: 15" Free Float M-LOK RailBCG: Black Nitride BCG, Nitride Finish, 9310 Steel Magnetic Particle Inspected(MPI) Bolt, Tool Steel Extractor. (Lifetime Warranty)CH: Ambidextrous Charging Handle