Anderson Manufacturing's AM-15 Stripped Upper Receiver is exactly what you need to complete your AR-15 build. It's made from high quality aluminum with precision manufacturing processes. Anderson Manufacturing's AM-15 Stripped Upper Receiver is the same upper receiver they use when constructing their fantastic AM-15 rifles. Features: 5.56 NATO/.223 Remington/.300 AAC Blackout AR-15/M4 Stripped Upper Receiver M4 Feed Ramps CNC Machined 7075 T6 Forged Aluminum Black Type III Hard Coat Anodized Non RF-85 Treated Coating Flat Topper Upper Receiver Forward Assist Compatible Dust Cover Compatible