Luth-AR Rear Base Sight Assy A1. Designed for an A1 upper receiver it's combined with the front sight (not included) to give your retro Mil-Spec AR the look and performance of the iconic rifle. Specifications for Luth-AR A1 Rear Sight Assembly: Manufacturer: Luth-AR Condition: New Finish: Anodized Color: Black Features of Luth-AR A1 Rear Sight Assembly: All-steel construction Non-reflective matte black finish Complete rear sight assembly kit Package Contents: Luth-AR A1 Rear Sight Assembly Luth-AR UR-21A: Rear Base Sight Assy A1