The Bushmaster QRC (Quick Response Carbine) complete upper assembly is everything needed in an AR-15, without expensive or useless accessories. The 16" superlight contour barrel houses the mil-spec A2 flash hider on the end, and is melonite treated for ease of cleaning and a long service life. The 1x8 twist rate allows for stabilization of almost all over-the-counter projectiles in common use. This Includes the Charge Handle and BCG.