All partial AR-9 uppers are assembled with everything you need less the charging handle and bolt carrier group. AR-15 Overstock AR-9 uppers offer 9mm function in a versatile AR platform. Experience superior quality and exceptional performance from every upper assembly you purchase from AR-15 Overstock. Better yet, all of our AR-15 Overstock AR-9 uppers are custom built-to-order enabling us to provide you with the best prices you will find anywhere. The quality of our uppers are backed by our Lifetime Warranty ? if any AR-15 Overstock upper assembly becomes defective, we will repair or replace it at no charge. Get your partial AR-9 upper at AR-15 Overstock today!