The Badger State Ordnance SPARTAN Upper Receiver is a flat top, high grade, drop in receiver, ready to be mounted to any Mil-Spec AR-15 lower receiver! This mil-spec compliant receiver is loaded with options and provides a high-quality upper for any budget. Comes complete and assembled with Upper Receiver, Forward Assist, Ejection Port Door, Barrel Nut, Hand Rail, Barrel, gas system, and your choice of a Muzzle Device. All uppers are test fired and cleaned prior to shipping. Bolt Carrier Group and Charging Handle are additional.