The material is a reflector gunsight glass that conforms to MIL-R-6771, Type 1. The color is lusterless black (No.37038), in accordance with FED-STD-595. It's an upper type item, with a maximum line of sight deviation of 15 seconds and beveled edges featuring fine gray ground. The reflective coating is non-polarized, with 24% porosity and 3% reflectance. Additionally, it has anti-reflective coating (high-efficiency Type MGFL) per MIL-C-675, resulting in a maximum average reflectance of 0.9%, and a maximum absolute reflectance of 1.4%. The wavelegth range reflectance spans 400-700 nanometers at an angle of incidence with porosity of 10% and 51 degrees. Its overall dimensions are 16.520 inches long, 8.750 inches wide, and 0.230 inches thick.