Tacfire's AR Pistol Build Kit Includes: (1) 9MM 4.5" Barrel USA Made, (1) 9MM Bolt Carrier Group, (1) Mil-Spec Upper Receiver USA Made, (1) Slim Free Float MLOK Hand Guard 4", (1) Complete Lower Parts Kit USA Made, (1) Standard Receiver End Plate, (1) Mil-Spec/Commercial Castle Nut/Steel, (1) Mil-Spec Pistol Buffer Tube/Alum. w/Foam Cover, (1) Heavy Buffer, (1) Buffer Tube Spring, (1) Mil-Spec Charging Handle, (1) Dust Cover, (1) Forward Assist, (1) 1/2"x36 Thread Flash Forwarder