The Luth-AR UR-01-M16 A1 stripped upper receiver is precision-manufactured from aluminum with a durable black hardcoat anodized finish for M16 platform builds chambered in 223/5.56mm NATO.Luth-AR UR-01-M16 A1 Stripped Upper ReceiverCompatible with 223/5.56mm NATO cartridgesAluminum construction with black hardcoat anodized finishM16 A1 configuration for classic rifle buildsSKU: UR-01-M16 UPC: 812058030744Ideal for custom M16 A1 builds and restorations providing a solid foundation for shooters looking to assemble a reliable and accurate rifle platform.