Five AR Upper Receivers. 1) 16" round 5.56 caliber upper receiver with bolt carrier group. Charging handle absent. 2) 16" round upper receiver with bolt carrier group. No caliber markings on the barrel. Charging handle absent. 3) 16" round 5.56 caliber complete upper receiver. 4) 11 1/2" round stainless steel 5.56 caliber complete upper receiver. 5) 11 1/2" round 5.56 upper receiver. Bolt carrier group and charging handle absent.