RTBA has now started carrying custom upper builders kits. These kits allow you to fully customize your build kit and get the exact parts you want. Don’t want the mil-spec parts? Pick a Fail Zero, Faxon, Anderson, CMMG, WMD, UTG, or Radian part instead. Our goal is to get you the product you want exactly. You can also remove any components you don’t need, giving you the power of a fully customizable experience. Shop our BYOU line today!