The material used is a reflector gunsight glass as per MIL-R-6771, Type 1. The color is lusterless black (No.37038) in accordance with FED-STD-595. This item has an upper type design, a line of sight deviation of 15 seconds maximum, beveled edges, and fine gray ground. The reflective coating is non-polarized, with a 24% reflectance and 3% porosity, while the anti-reflective coating is high-efficiency Type MGFL as per MIL-C-675. With incident non-polarized light, the maximum average reflectance is 0.9%, and the maximum absolute reflectance is 1.4%. The wave length range of reflectance is between 400-700 nanometers, with an angle of incidence of up to 10% at 51 degrees. The dimensions are 16.520 inches in length, 8.750 inches in width, and 0.230 inches in thickness.