The Luth-AR UR-01-E3-SA A1 Upper Receiver is a fully assembled upper receiver designed for 5.56 NATO/.223 Remington chamberings with a classic slick side A1 profile.Luth-AR UR-01-E3-SA A1 Upper Receiver5.56 NATO/.223 Remington chamber compatibilitySlick side A1 design without forward assistAluminum construction with black hardcoat anodized finishFully assembled and ready to installSKU: UR-01-E3-SA UPC: 812058032205Perfect for AR-15 builds seeking a streamlined reliable upper receiver with classic A1 styling and durable corrosion-resistant finish for tactical recreational or competitive shooting applications.